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Stay in touch从ffmpeg filter里出来的数据直接送给avcodec_encode_audio2编码，写文件有错。 - youngt - 推酷
从ffmpeg filter里出来的数据直接送给avcodec_encode_audio2编码，写文件有错。 - youngt
/mingyuejingque/item/78e71aff57ae9ec5a835a2e4
st = avformat_new_stream( m_oc, NULL);
& & if (!st) {
& & & & fprintf(stderr, &Could not allocate stream\n&);
& & & & exit(1);
& & st-&id = m_oc-&nb_streams-1;
AVCodecContext *c = st-&
c-&codec_type = in_stream-&codec-&codec_
/* Some formats want stream headers to be separate. */
if (m_oc-&oformat-&flags & AVFMT_GLOBALHEADER)
c-&flags |= CODEC_FLAG_GLOBAL_HEADER; & &
& & switch ((codec)-&type) {
& & case AVMEDIA_TYPE_AUDIO:
& & & & c-&sample_fmt = FORCE_smaple_
&// & & & c-&bit_rate = FORCE_BIT_RATE;
& & & & c-&sample_rate = FORCE_sample_
c-&codec_id = FORCE_CODEC_AUDIO;
& & & & c-&channels = in_stream-&codec-&
c-&channel_layout & = in_stream-&codec-&channel_
c-&time_base = in_stream-&codec-&time_
// c-&profile = FORCE_
m_AudioStream =
/* open it */
ret = avcodec_open2(c, codec, NULL);
if (ret & 0) {
printf(&Could not open audio codec&);
m_CodecContext = //这是音频编码的,视频没做编码。
/* Some formats want stream headers to be separate. */
if (m_oc-&oformat-&flags & AVFMT_GLOBALHEADER)
c-&flags |= CODEC_FLAG_GLOBAL_HEADER; & &
叼，这样写的代码有个潜规则，那就是：
if (av_buffersrc_add_frame_flags(m_filter_in_param.buffersrc_ctx, in_frame, 0) & 0) {
av_log(NULL, AV_LOG_ERROR, &Error while feeding the audio filtergraph\n&);
while (1) {
ret = av_buffersink_get_frame(m_filter_in_param.buffersink_ctx, filt_frame);
if(ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
if(ret & 0)
ret = avcodec_encode_audio2(m_CodecContext, new_packet, filt_frame, &got_frame);
av_frame_free( &filt_frame );
if ( got_frame )
从这里编码出来的packet，让ffmpeg写到文件里去的时候会报错：
[mp4 @ 0119ad00] Malformed AAC bitstream detected: use audio bitstream filter&
'aac_adtstoasc' to fix it ('-bsf:a aac_adtstoasc' option with ffmpeg)
小孩子要什么filter来修正啊，叼，试了大半天也不知道哪个合适，并且也不想随便就加filter下去，万一它消耗太多cpu怎么办。
又是看ffmpeg的源码，avcodec_open2 &看到返回0是正常的，内部调用了c-&codec_init() 我也看到aacenc.c里去了，用反证法：它里面要是说参数又问题，肯定会返回负值，既然返回0就说明它是正常执行的。
AVCodec *codec = avcodec_find_encoder( codecid ); //这个没什么好说，下面又没对codec做什么改变。
下面的AVCodecContext *c = st-&你就诡异了，
/* open it */
ret = avcodec_open2(c, codec, NULL);
if (ret & 0) {
printf(&Could not open audio codec&);
严重怀疑c，c就是stream-&codec,这个stream是在AVFormatContext *m_oc里的流。 跟到ffmpeg源码里去，发现是：
c-&flags |= CODEC_FLAG_GLOBAL_HEADER; & 这个标志位没设置，叼，一般这个都是写在函数末尾，这里先提前了，放到avcodec_open2前面去，这肯定是我粗心大意？
/* Some formats want stream headers to be separate. */
if (m_oc-&oformat-&flags & AVFMT_GLOBALHEADER)
c-&flags |= CODEC_FLAG_GLOBAL_HEADER; &&
avcodec_open2( c, codec, NULL ); 哟西，没事了。假装没事发生。。。。。。。。
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与原文不一致2014年八年级下册英语Unit7课文详解
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文 章来源 莲山 课 件 w w w.5Y k J. c oM Unit 7 What’s the highest mountain in the world?Section ALanguage Goal: Talk about geography and naturegeography [dʒiˈɔrəfi]地理nature [ˈneitʃə]自然
1a Match the facts you know.Qomolangma[ˈtʃəuməuˌl: ŋmə]&about 9,600,000 square kilometers in sizeThe Sahara[&ə səˈh:rə]&1,025 meters deepThe Caspian Sea [&ə ˈk&spiən si:]]&6,671 kilometers longThe Nile[&ə naɪl]&8,844.43 meters high
square不可数名词，意为“平方”。 The old city covers an area of about 326 square kilometers. 这个古老城市的面积大约是326平方千米。16 is the square of 4. 十六是四的平方。(1)square作可数名词，意为“正方形”。The cookies were in the form of squares. 那些饼干是正方形的。②square作可数名词，意为“广场;街区”。Tian'anmen Square天安门广场We live three squares from the school我们住在离学校三个街区的地方。
1b Listen and complete the sentences.1. Qomolangma is _higher__ than any other mountain in the world.2. The Sahara is __the biggest__ desert in the world.3. The Caspian Sea is __the deepest___ of all the salt lakes.4. The Nile is __the longest___ river in the world.
population是一个集合名词，意为“人口”(1 )population常与定冠词the连用，作主语用时，谓语动词常用第三人称单数形式。The world's population is increasing faster and faster.全世界的人口增长得越来越快(2)当主语是表示“人口的百分之几、几分之几”时，谓语动词用复数形式。About seventy percent of the population in China are farmers.中国大约有百分之七十的人口是农民。(3)有时population可用作可数名词，其前可用不定冠词。New York is a big city with a population of over 10 million纽约是一个有一干多万人口的大城市。（4)表示人口的“多”或“少”，不用“much”或“little”，而要用“large”或“small”India has a large population印度人口众多。Singapore has a small population新加坡人口少。 (5)询问某国、某地有多少人口时，不用“How much …?而用“How large.…？问具体人口时“What’s the population of. . .？”How large is the population of your hometown？你们家乡有多少人口?What is the population of Canada? 加拿大的人口有多少?
&1c Use the information in 1b to make conversations.A: What is the highest mountain in the world?B: Qomolangma.
2a Listen and number the facts ［1-4］ in the order you hear them.6,300&&&& 5,000&&&& 5,464&& 300__4_The Yangtze River is about _6，300_____kilometers long and the Yellow River is __5，464____ kilometers long._2_China has the biggest population in the world. It’s a lot bigger than the population of the US._1__China is over __5，000__ years old. It has a much longer history than the US. The US is not even _300__ years old._3__China is almost as big as the US, but t is the biggest country in Asia.
2b Listen again and fill in the blanks in 2a with the numbers in the box.
2c Make conversations using the information in 2a.A: Did you know that China is one of the oldest countries in the world?B: Yes, I did. It’s much older than my country.
2d Role-play the conversation.Guide: Feel free to ask me anything on today’s Great Wall tour.Tourist 1: How long is the wall?Guide: Ah, the most popular question! If we’re only talking about the parts from the Ming Dynasty, it’s about 8,850 kilometers long. This makes it the longest wall in the world.Tourist 2: Wow, that’s amazing! Why did the ancient emperors build the wall?Guide: The main reason was to protect China. As you can see, it’s quite tall and wide. As far as I know, there are no man-made objects as big as this.Tourist 3: Is Badaling part of the Ming Great Wall?Guide: Yes, it’s the most famous part.feel free“随便，轻松”。I love my work, and I feel free. 我喜欢我的工作。我觉得我现在自由自在feel free to do sth随意做某事If you need help with anything, please feel free to ask me.如果有什么需要我帮助之处尽管找我，请不要客气。 Feel free to eat dinner here anytime 你随时都可以来这里吃晚餐!
tour可数名词，意为“旅行;旅游”。We are planning a tour around the world. 我们正计划环球旅行。
protect及物动词，“保护;防护”There're fewer animals. It's important for us to protect them动物们越来越少，对于我们来说保护它们很重要。（1）protect…from/against…保护....使不受....；防御。He is wearing sunglasses to protect his eyes from the strong sunlight.他戴着太阳镜以遮挡强烈的阳光。②protection不可数名词，意为“保护，防御”The hat will give protection against the sun这顶帽子可遮阳。③under the protection of…& 在……的保护下。The chicks are under the protection of the hen 小鸡们处在母鸡的保护下。
3a Read the article and match each paragraph with the main ideas.Paragraph 1Spirit of climbers登山者的精神Paragraph 2 Achievements of climbers登山者的成就Paragraph 3 Facts and dangers事实与危险Qomolangma―the Most Dangerous Mountain in the World?One of the world’s most dangerous sports is mountain climbing, and one of the most popular places for this is the Himalayas[&ə ˌhiməˈleiəz]. The Himalayas run along the southwestern part of China. Of all the mountains, Qomolangma rises the highest and is the most famous. It is 8,844.43 meters high and so is very dangerous to climb. Thick clouds cover the top and snow can fall very hard. Even more serious difficulties include freezing weather conditions and heavy storms. It is also very hard to take in air as you get near the top.thick形容词，此处意为“浓的，稠的”，反义词为thinThe old man likes to eat thick soup. 那个老人喜欢喝浓汤。（1）thick作形容词，意为“厚的”。His English-Chinese dictionary is very thick他的英汉词典很厚:②think作形容词，意为“茂密的，密集的”。a thick head of hair一头浓密的头发③thick作形容词，意为“粗的，粗壮的”。There is a thick tree in the yard院子里有一棵粗壮的树。
include及物动词，意为“包括，包含”，指包含其中的一部分。The price includes both house and furniture. 这个价格包括房子和家具The class of twenty includes eight girls. 全班二十人中包括八个女生。①&include作动词，还可意为“算在内;列在里面”。Please include me in your group. 请把我算在你们组内。 ②&included形容词，无比较等级，一般位于名词或代词之后，意为“包括在内”Everyone laughed, me included 每个人都笑了，包括我在内。③&including介词，意为“包括;包含在内、和其后的名词/ 代词一起形成介宾短语。There are 40 students in the classroom, including me. 包括我在内，教室里有40名学生。
freezing形容词，意为“结冰的; 冻冰的”It was freezing cold that morning. 那天早晨非常冷。（1）freezing可用作名词，“冰点”。The temperature is below freezing. 气温在零度以下②freeze是动词，“结冰，凝固”。Water freezes below freezing. 冰点以下时水结冰。condition名词，“条件，状况”既可作可数名词，也可作不可数名词。It's terrible to study in such conditions.在这种状况下学习很糟糕。We are interested in the work conditions in Africa. 我们对非洲的工作状况感兴趣。The player is in very good condition, but his living conditions are very bad.这个运动员的健康状况良好，但他的生活条件非常槽糕。on condition that十从句”表示“如果……，在……条件下”。He can use the bicycle on condition that he return(s) it tomorrow.他可以使用自行车，条件是明天必须归还。
take in为固定短语，意为“吸入;吞入(体内”Open the window and take in fresh air.打开窗户，吸收新鲜空气。take in的其他含义:①接待(某人)留宿He had nowhere to sleep so we offered to take him in他没有地方可睡，于是我们提出让他留宿。②包含;包括This is the total cost of the holiday, taking everything in这是度假的全部费用，一切都包括在内。④&把(衣服)改窄Could you take the dress in for me? 你能把我的这件连衣裙改窄点吗?④充分理解，掌握It took me a long time to take in what you were saying.我费了好长时间才明白你说的话。
The first people to reach the top were Tenzing Norgay and Edmund Hillary on May 29,1953. The first Chinese team did so in 1960, while the first woman to succeed was Junko Tabei from Japan in 1975. succeed动词，意为“实现目标;成功”，是不及物动词，因此不能用于被动语态。His plan succeeded他的计划成功了。（1）succeed in doing sth. 成功做成某事 He is certain to succeed in doing his experiment. 他做试验一定会成功。②succeed with sth.在某方面获得成功You won't succeed with the work if you don't put your mind to it如果你不把心放在工作上，工作就不会做好。
Why do so many climbers risk their lives? One of the main reasons is because people want to challenge themselves in the face of difficulties. The spirit of these climbers shows us that we should never give up trying to achieve our dreams. It also shows that humans can sometimes be stronger than the forces of nature.challenge及物动词，意为“挑战;考验”。He challenged anyone to beat him他向任何要打败他的人挑战。I only like to study something if it really challenges me. 我只喜欢研究真正对我有所考验的东西。challenge的其他用法①作名词，意为“(挑战、决斗、比赛等的)邀请;挑战书”等。a letter of challenge挑战书②作名词，意为“挑战，邀请比赛”。accept a challenge to run a race 接受赛跑的挑战in the face of为固定短语，意为“面对(问题，困难等)”。He showed great bravery in face of danger. 面对危险他表现非常勇敢。He keeps sense of humour in the face of great difficulties. 面对极大的困难，他保持幽默感。
achieve及物动词，意为“达到;完成;成功”，其宾语可以是“实现”的目标、目的等，也可以是“取得”的胜利、成功、名誉、地位等。Everybody should be given the chance to achieve their aims. 要让每个人都有机会实现自己的目标。She achieved no success. 她没有获得成功。achieve 有时与 this, that, what, all, much, anything, nothing, a little等代词连用，表示“获得(成功)”或“取得(成就)”等。No one can achieve anything without effort. 谁也不可能不努力而有所作为。②achievement名词，意为“成就，业绩(可数);实现，达到，成功(不可数)".We felt a great sense of achievement when we reached the top of the mountain当我们到达山顶时，我们感到有一种巨大的成就感。
force名词，意为“力;力量”。（1）表示物质方面的“力”，是可数名词。the forces of nature自然力量 ②表示物理方面的“力”，是不可数名词。the force of an explosion 爆炸力force可用作动词，“强迫;迫使”。force sb. to do sth. = force sb. into doing sth迫使某人做某事。They forced him to leave the small town. =They forced him into leaving the small town他们强迫他离开小镇。
natural形容词，意为“自然的;天然的;非人力所为的;天生的”The country's natural resources include forests, coal and oil.这个国家的自然资源包括森林、煤和石油。It is natural for a child to love its mother. 孩子爱母亲是常情He is a natural musician. .他天生是个音乐家。
3b Read the article again and complete the chart.Paragraph 1&Paragraph 2&Paragraph 3List four dangers for climbers&List three achievements&List four comparisonsthick clouds&1953-Tenzing Norgay and Edmund Hillary were the first to reach the top&most dangerous sport3c Answer the questions using information in the article.1. Where are the Himalayas?2. How high is Qomolangma?3. Why do so many people try to climb this mountain even thought it is dangerous?4. What does the spirit of the climbers tell us?
&Grammar FocusWhat’s the highest mountain in the world?&Qomolangma.How high is Qomolangma?&It’s 8,844.43 meters high.It’s higher than any other mountain.Which is the deepest salt lake in the world?&The Caspian Sea is the deepest of all the salt lakes.Did you know that China is one of the oldest countries in the world?&Yes, I did.It’s much older than the US.4a Fill in the blanks with the correct forms of the words in the box.big&& much&& popular&& long&& old&& high1. The Amazon River is one of the _longest__ rivers in the world. It’s a little _longer_ than the Yangtze River.2. Qomolangma is 8,844.43 meters__high__ .It’s one of the most _popular__ places for serious mountain climbers.3. No ocean in the world is as __big__ as the Pacific Ocean.4. Although Japan is __older__ than Canada, it is _much__ smaller.
4b Write two comparisons about two topics. Write true facts.e.g. Two rivers: The Yangtze River and the Amazon RiverThe Yangtze River is almost as long as the Amazon River.The Amazon is longer than the Yangtze, but the Yangtze is the longest river in China.Two cities: ________________ and& ________________ 1. ________________2. ________________Two animals: ________________ and& ________________1. ________________2. ________________4c Write five questions using comparisons.Then ask your partner your questions.1. What’s is the highest building in our city?2. ________________3. ________________4.& ________________5. ________________
Section B1a Compare facts about these two animals. Use the language in the box to help you make sentences.
Elephant-is 350 cm tall-weighs [weiz] 5,000 kilos-eats 150 kilos of food a dayweigh动词，意为“有……重; 重”。①表示“重(多少)"，是连系动词。He weighs 60 kilos. 他体重60千克。How much does it weigh? 它的重量有多少?②表示“称……的重量”，是及物动词。He weighed the fish. 他称了这条鱼。 weight不可数名词，意为“重量，体重”。What's the weight of the sheep? 这只羊的重量是多少?
Panda-is 150 cm tall(standing on two legs)-weighs 100 kilos
Example sentence:This elephant weighs many times more than this panda.(200 cm taller / shorter, weigh much more / less, eat much more / less, eat many times more)many tones more than 意为“比……多许多倍”。常见的倍数表达法:①“A十倍数十形容词或副词的比较级十than十B”，表示“A比B大(长、高、宽等)多少倍、This hall is five times bigger than our classroom这个大厅比我们的教室大四倍(是我们教室的五倍)。（2）A十倍数十as十形容词或副词的原级十as十B，表示“A正好是B的多少倍”。Asia is four times as large as Europe. 亚洲的面积是欧洲的四倍。This big stone is three times as heavy as that one. 这块大石头的重量是那块的三倍③“...times十more 十名词(可数或不可数)十than十被比对象There are five times more books in our library than in yours. 我们图书馆里的书比你们图书馆多四倍。
1b Listen and check (√) the numbers you hear.&_____100& _____16& _____20& _____50&_____120& √& 0.1& _____0.2& _____150
1c Listen again and complete the sentences.1. At birth, a baby panda is about _0.1__to _0.2__ kilos.2. At birth, a baby panda is about _15__ cm long.3. A baby panda is not black. It is _pink__ and it has no _teeth_.4. A panda can live up to _20_to _30_years.at birth意为“出生时”。She weighed eight pounds at birth她出生时重八磅。 （1）birth不可数名词，“出生;诞生”。Do you know the date of his birth? 你知道他的生日吗?②birth不可数名词，意为“出身，家世”。He was of noble birth. 他出身高贵。③by birth在血统上;天生。He is an actor by birth. 他天生是个演员up to直到；倒......为止Up to now everything has been successful. 到目前为止，一切都很顺利up to的其他含义:①是某人的责任;由某人决定I think I will leave it up to you. 我想让你全权做主。②计谋什么(坏事)Do you know what he is up to? 你知道他想做什么吗?③胜任She's not up to the job. .她不胜任那项工作。
1d Take turns telling your classmates about pandas.A: A baby panda cannot see.B: An adult panda weighs many times more than a baby panda.
2a Talk about pandas in your class. Use these words to help you.big bamboo zoo popular cute black and white Sichuan famous endangered beautiful forest protect
2b Scan the article to find out what these numbers mean:10,12,200,2,000.
ScanningThis means moving your eyes quickly down the page to find specific information.
It is 8:30 a.m. at the Chengdu Research Base. Lin Wei and the other panda keepers are preparing the milk for the baby pandas’ breakfast. At 9:00 a.m., they find that most of the babies are already awake and hungry. When the babies see the keepers, they run over with excitement and some of them even walk into their friends and fall over!awake形容词，“醒着的”在句中只能作表语，不能作定语。awake的反义词为asleep，意为“睡着的”。It's eleven at night, he is still awake. 夜里十一点，他还没有睡辨析;awake与wakeawake形容词，作表语，意思是“醒着的”Is he awake or asleep？他醒着还走睡着?wake动词“醒；叫醒、常与副词up连用What time do you usually wake (up)？你通常在什么时候醒来?
“They’re so cute and lovely. I take care of them like they’re my own babies. I was, feed and play with them every day. They’re very special to me.”Lin Wei loves her job, but it is a difficult one.Pandas do not have many babies, maybe only one every two years. The babies often die from illnesses and do not live very long. Adult pandas spend more than 12 hours a day eating about 10 kilos of bamboo. Many years ago, there were a lot more bamboo forests and pandas in China than there are now. But then humans started to cut down the forests, and there was less bamboo for the pandas. Scientists say there are now fewer than 2,000 pandas living in the remaining forests. Another 200 or so live in zoos or research centers in China and other countries.every two years为固定短语，“每两年”。 every与数词或few, other等连用，表示时间或空间的间隔，其形式有:①every十基数词十复数名词I go there every three days. 我每隔两天(每三天)到那儿去一趟。②every十other十单数可数名词。译为:每隔几……He goes to town every other day. 他每隔一天进城一次。③every十few十复数名词。译为:“每隔几……”He stopped and turned around every few meters. 他每走几米就停下来向四周看一看。
die from“因……而死”；其宾语表示死亡的原因，当表示因病而死时，可与die of通用;具体使用时常用于由于外部创伤或间接的原因致死，如;由于衰弱，饮食过度，劳累或不明原因致死He died from an accident/ a wound / disease/ overwork/ polluted air他死于事故、受伤、疾病、过度劳累、污染的空气die of“因……而死”；其宾语表示死亡的原因，当表示因病而死时，可与die from通用;具体使用时die of一般用于害病，疲劳，寒冷，饥渴，年老、失望，悲伤等患情原因等造成死亡He died of fear/ disappointment/ disease/ old age/ hunger/ cold他死于恐惧、失望、疾病、年老、饥饿、寒冷。
illness名词，“疾病;病”，通常指因病而导致的不健康的状态。其形容词为ill。He can't come because of illness. 因病不能来。He died after a long illness. 他死之前病了很久。disease通常指具体的某种疾病。He got a disease during the war. 战争期间他患上了一种疾病。
adult形容词，意为“成年人，成人的”。He is an adult man. 他是一个成年男子。adult作可数名词，意为“成年人;大人” They are all young adults. 他们都是青壮年。
spend some time (in) doing sth. 意为“花费时间做某事”。Tom spent two days reading the book. 汤姆花了两天时间读这本书。
remaining形容词，“剩下的”“余下的”，修饰单个名词作定语，置于该名词之前作前置定语。She returned home with the remaining 10 dollars. 她带着剩下的10美元回到了家。I bought a gift for her with the remaining money. 我用剩余的钱给她买了一件礼物。①remain作不及物动词，意为“遗留;剩余、After the fire, very little remained of their housej火灾之后，他们家所剩无几Only a few leaves remained on the tree.树上只剩下几片叶子了。②remam作连系动词，意为“保持，仍然是，依旧是”He remained silent. 他保持沉默。It remained a secret. 这仍然是个秘密。
An education program in Chengdu teaches children in cities about pandas and other endangered animals. They send people to schools to tell children about the importance of saving these animals. The children sing songs or make artwork about pandas and other wild animals. Teaching children is one way to help save pandas. The Chinese government is also planting more bamboo trees so there will be more forests for pandas to live in. We all hope that in the future there will be a lot more pandas than now.wild形容词，意为“野生的”。There are some wild flowers on both sides of the road公路两旁有许多野花。We should protect the wild animals. 我们应该保护野生动物。
2c Scan the article again and write short answers to the questions.1. What is Lin Wei’s job? A panda keeper2. What do the baby pandas eat for breakfast? Milk3. What do adult pandas eat? Bamboo 4. Why are pandas endangered? Humans cut down bamboo forests, pandas don't have babies often and baby pandas often die from illness and don't live very long,5. What is one way of saving pandas? Teaching children.
2d& Complete the sentences using words and phrases from the passage.1. The panda _keepers_ at the Chengdu Research Base are awake very early in the morning to _prepare__breakfast for the baby pandas.& 2. Adult pandas do not have babies very _often__and some of the babies only live for a short time because of _illness__.3. Another reason for fewer and fewer pandas is because people are cutting down _bamboo__so pandas have fewer places to live.4. A special program in Chengdu teaches _children___about why pandas are_endangered__ and how to save them.5. The _Chinese_ government_is also helping to save the pandas. It is_planting__ more trees to make more homes for the pandas.
2e What other ways do you think children can help to save the pandas?
3a Read the following words and phrases about whales. Put them in the correct place in the chart.Humans catch whales for meat, fat and oilEat small fish and other sea lifeJump high out of the waterRules on whale protectionHugeWater pollution&Live in the seaSome kinds have teethLearn more about whalesStop putting rubbish into the seaSing songsWhale parts sold to make things like candles and soap
What do they eat?&S HugeWhere do they live?&Live in the sea What can they do?&Eat small fish and other sea life.What can they do?&Jump h Sing songs Why do some of them have to be protected?&Humans catch whales for meat, Whale parts sold to make things like candles and soapHow can they be protected?&Rules Stop putting rubbish into the sea
3b Write a paragraph about whales and why they need to be protected. Include all of the information in 3a.Then make a poster.& Whales are… They live in… They eat… They can…One interesting fact is… Another interesting fact is…Some kinds of whales are in danger because…We should protect whales from…I think people should / shouldn’t
Self-CheckComplete the chart.Adjectives&Comparatives&Superlativeshigh&&dangerous&&long&&popular&&
2 Match verbs and objects. Then add one more object to each list.Verbs&Object1.reach&a.my life, my money, …2.achieve&b. the top of a mountain, the library,…3.risk&c. my dream, success, …
risk动词，“冒……危险”，常用短语risk one's life，“冒生命危险”。He would risk his life for his friend他愿为朋友出生入死。①risk作名词，意为“冒险;风险”。There is the risk of you losing fame. 你可能会丧失你的名誉（2）at the risk of“冒……之险，不顾……”He saved my life at the risk of his own, 他冒着自己的生命危险救了我的命。③at risk在危险中Were those patients now at risk? 那些病人现在是否处于危险之中呢?（4）at all risks (=at any risk)无论冒什么危险;无论如何He told me that he would go at all risks. 他跟我说不管有什么危险他也要去。（5）run/take the risk of doing sth. 冒险做某事& I wouldn't run the risk of being late for work我不会冒迟到的危险的。
3 Circle the correct word and / or fill in the blank with the correct form of the word in brackets for each sentence.1. An elephant weighs (few/many) times more than a dog.2. An adult panda can eat (much/a little) more than a cat.3. Canada is a (little/lot) less _______ (crowded) than China.4. A tiger is (much/a little) __ stronger_ (strong) than a man. 文 章来源 莲山 课 件 w w w.5Y k J. c oM
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