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你可能喜欢C　　The villagers of Yaluma in Southern Mexico are some of the poorest people in the country. But now they have an extra source of income.They are being paid to grow and develop forests by the organization in charge of Formula One racing (一级方程式赛车),which pumps 5,500 tons of carbon dioxide (CO2) into the air every year.The idea is that the forests being planted around Yaluma will absorb this amount. It will also provide people there with money while wiping out motor racing"s environmental debt.　　Projects like this go under the name of "carbon trading". The basic idea is that governments and companies can buy the right to pump CO2 into the air by investing in green projrvyd. They can buy so-called "carbon credits" from countries which have succeeded in reducing CO2 emissions(排放物).　　Supporters of carbon trading say that it brings money and green technology to poorer countries.It also provides a new way of doing busingess and spreading prosperity. They point out that the process of globalization will give people everywhere the most possible choice of products and services. Carbon trading is just another way of bringing that about. It is a "win - win" situation.　　Opponents argue that nature comes before lifestyle. CO2 emissions need to be reduced, not bought and sold. And they believe that the rich world should lead the way.People might be willing to change the way they live to help save the world, but not to help the rich countries keep a lifestyle that depends on pollution.　　Supporters of carbon trading believe in unlimited growth.Opponents believe that nature sets limits to the choices we make on how to live.It is "don"t do " against "can do". It is life against lifestyle.　　It is believed that modern lives are about choice.For example,the world can choose to take the danger of global warming seriously.And the sooner we choose to do it, the more choices we have about what to do next and the more time we have to do it in. We can also choose to pay no attention to the danger of global warming to keep our lifestyles. Then one day nature may give us no choice at all,and maybe not much of a life,either.　　64.Carbon trading is discussed in the text in order to show the importance of ______ . 　　　A.reducing pollution B.taking care of forests 　　　C.spreading prosperity D.choosing lifestyle or nature 　　65."Carbon credits" may be used to ______.　　　A.get the right to pump CO2 into the air　　　B.get the right to pump CO2 into poor countries 　　　C.learn about the way to reduce CO2 emissions　　　D.improve the way to reduce CO2 emissions 　　66.We can infer from the text that in the "win - win" situation _____. 　　　A.rich countries perform their duty to help poor countries　　　B.poor countries get what they need from rich countries　　　C.both rich countries and poor countries get what they need　　　D.rich countries learn from poor countries in reducing pollution 　　67.In the opinion of people who are against carbon trading,the rich countries should ____. 　　　A.guide poor countries in reducing CO2 emissions　　　B.show by example how to reduce emissions 　　　C.offer more help to save the world 　　　D.improve their lifestyles to keep the world clean - 跟谁学
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C　　The villagers of Yaluma in Southern Mexico are some of the poorest people in the country. But now they have an extra source of income.They are being paid to grow and develop forests by the organization in charge of Formula One racing (一级方程式赛车),which pumps 5,500 tons of carbon dioxide (CO2) into the air every year.The idea is that the forests being planted around Yaluma will absorb this amount. It will also provide people there with money while wiping out motor racing"s environmental debt.　　Projects like this go under the name of "carbon trading". The basic idea is that governments and companies can buy the right to pump CO2 into the air by investing in green projrvyd. They can buy so-called "carbon credits" from countries which have succeeded in reducing CO2 emissions(排放物).　　Supporters of carbon trading say that it brings money and green technology to poorer countries.It also provides a new way of doing busingess and spreading prosperity. They point out that the process of globalization will give people everywhere the most possible choice of products and services. Carbon trading is just another way of bringing that about. It is a "win - win" situation.　　Opponents argue that nature comes before lifestyle. CO2 emissions need to be reduced, not bought and sold. And they believe that the rich world should lead the way.People might be willing to change the way they live to help save the world, but not to help the rich countries keep a lifestyle that depends on pollution.　　Supporters of carbon trading believe in unlimited growth.Opponents believe that nature sets limits to the choices we make on how to live.It is "don"t do " against "can do". It is life against lifestyle.　　It is believed that modern lives are about choice.For example,the world can choose to take the danger of global warming seriously.And the sooner we choose to do it, the more choices we have about what to do next and the more time we have to do it in. We can also choose to pay no attention to the danger of global warming to keep our lifestyles. Then one day nature may give us no choice at all,and maybe not much of a life,either.　　64.Carbon trading is discussed in the text in order to show the importance of ______ . 　　　A.reducing pollution B.taking care of forests 　　　C.spreading prosperity D.choosing lifestyle or nature 　　65."Carbon credits" may be used to ______.　　　A.get the right to pump CO2 into the air　　　B.get the right to pump CO2 into poor countries 　　　C.learn about the way to reduce CO2 emissions　　　D.improve the way to reduce CO2 emissions 　　66.We can infer from the text that in the "win - win" situation _____. 　　　A.rich countries perform their duty to help poor countries　　　B.poor countries get what they need from rich countries　　　C.both rich countries and poor countries get what they need　　　D.rich countries learn from poor countries in reducing pollution 　　67.In the opinion of people who are against carbon trading,the rich countries should ____. 　　　A.guide poor countries in reducing CO2 emissions　　　B.show by example how to reduce emissions 　　　C.offer more help to save the world 　　　D.improve their lifestyles to keep the world clean
C　　The villagers of Yaluma in Southern Mexico are some of the poorest people in the country. But now they have an extra source of income.They are being paid to grow and develop forests by the organization in charge of Formula One racing (一级方程式赛车),which pumps 5,500 tons of carbon dioxide (CO2) into the air every year.The idea is that the forests being planted around Yaluma will absorb this amount. It will also provide people there with money while wiping out motor racing"s environmental debt.　　Projects like this go under the name of "carbon trading". The basic idea is that governments and companies can buy the right to pump CO2 into the air by investing in green projrvyd. They can buy so-called "carbon credits" from countries which have succeeded in reducing CO2 emissions(排放物).　　Supporters of carbon trading say that it brings money and green technology to poorer countries.It also provides a new way of doing busingess and spreading prosperity. They point out that the process of globalization will give people everywhere the most possible choice of products and services. Carbon trading is just another way of bringing that about. It is a "win - win" situation.　　Opponents argue that nature comes before lifestyle. CO2 emissions need to be reduced, not bought and sold. And they believe that the rich world should lead the way.People might be willing to change the way they live to help save the world, but not to help the rich countries keep a lifestyle that depends on pollution.　　Supporters of carbon trading believe in unlimited growth.Opponents believe that nature sets limits to the choices we make on how to live.It is "don"t do " against "can do". It is life against lifestyle.　　It is believed that modern lives are about choice.For example,the world can choose to take the danger of global warming seriously.And the sooner we choose to do it, the more choices we have about what to do next and the more time we have to do it in. We can also choose to pay no attention to the danger of global warming to keep our lifestyles. Then one day nature may give us no choice at all,and maybe not much of a life,either.　　64.Carbon trading is discussed in the text in order to show the importance of ______ . 　　　A.reducing pollution B.taking care of forests 　　　C.spreading prosperity D.choosing lifestyle or nature 　　65."Carbon credits" may be used to ______.　　　A.get the right to pump CO2 into the air　　　B.get the right to pump CO2 into poor countries 　　　C.learn about the way to reduce CO2 emissions　　　D.improve the way to reduce CO2 emissions 　　66.We can infer from the text that in the "win - win" situation _____. 　　　A.rich countries perform their duty to help poor countries　　　B.poor countries get what they need from rich countries　　　C.both rich countries and poor countries get what they need　　　D.rich countries learn from poor countries in reducing pollution 　　67.In the opinion of people who are against carbon trading,the rich countries should ____. 　　　A.guide poor countries in reducing CO2 emissions　　　B.show by example how to reduce emissions 　　　C.offer more help to save the world 　　　D.improve their lifestyles to keep the world clean科目:最佳答案

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关注我们官方微信关于跟谁学服务支持帮助中心Sequence of Verb Tenses
Sequence of Verb Tenses
Although the various shades of time and sequence are usually conveyed adequately in informal speech and writing, especially by native speakers and writers, they can create havoc in academic writing and they sometimes are troublesome among students for whom English is a second language. This difficulty is especially evident in complex sentences when there is a difference between the time expressed in an independent clause and the time expressed in a dependent clause. Another difficulty arises with the use of infinitives and participles, modals which also convey a sense of time. We hope the tables below will provide the order necessary to help writers sort out tense sequences.
As long as the main clause's verb is in neither the past nor the past perfect tense, the verb of the subordinate clause can be in any tense that conveys meaning accurately.
When the main clause verb is in the past or past perfect, however, the verb in the subordinate clause must be in the past or past perfect.
The exception to this rule is when the subordinate clause expresses what is commonly known as a general truth:
In the 1950s, English teachers still believed that a background in Latin is essential for an understanding of English.
Columbus somehow knew that the world is round.
Slaveowners widely understood that literacy among oppressed people is a dangerous thing.
The tables below demonstrate the correct relationship of tenses between clauses where time is of the essence (i.e., within sentences used to convey ideas about actions or conditions that take place over time).
for a table describing the various tenses of the active voice.
for a table describing tense sequences of infinitives and participles.
Tense inIndependentClausePurpose of Dependent Clause/Tense in Dependent ClauseExample(s)
SimplePresent
To show same-time action, use the present tenseI am eager to go to the concert because I love the Wallflowers.
To show earlier action, use past tenseI know that I made the right choice.
To show a period of time extending from some point in the past to the present, use the present perfect tense.They believe that they have elected
the right candidate.
To show action to come, use the future tense.The President says that he will
veto the bill.
SimplePast
To show another completed past action, use the past tense.I wanted to go home because I missed my parents.
To show an earlier action, use the past perfect tense.She knew she had made the right choice.
To state a general truth, use the present tense.The Deists believed that the universe is like a giant clock.
PresentPerfectorPastPerfect
For any purpose, use the past tense.She has grown a foot since she turned nine.The crowd had turned nasty before the sheriff returned.
To show action happening at the same time, use the present tense.I will be so happy if they fix my car today.
To show an earlier action, use the past tense.You will surely pass this exam if you studied hard.
To show future action earlier than the action of the independent clause, use the present perfect tense.The college will probably close its doors next summer if enrollments have not increased.
FuturePerfect
For any purpose, use the present tense or present perfect tense.Most students will have taken sixty credits by the time they graduate.
Most students will have taken sixty credits by the time they have graduated.
Sequence of TensesWith Infinitives and Participles
Like verbs, infinitives and participles are capable of conveying the id therefore, it is important that we observe the appropriate tense sequence when using these modals.
INFINITIVES
Tense ofInfinitiveRole of InfinitiveExample(s)
PresentInfinitive(to see)
To show same-time action or action later than the verbCoach Espinoza is eager to try out her new drills. [T the trying out will happen later.]
She would have liked to see more veterans returning. [The present infinitive to see is in the same time as the past would have liked.]
PerfectInfinitive(to have seen)
To show action earlier than the verbThe fans would like to have seen some improvement this year. ["Would like" describes "to have seen" describes something prior to that time.]
They consider the team to have been coached very well. [The perfect infinitive to have been coached indicates a time prior to the verb consider.]
PARTICIPLES
Tense ofParticipleRole of ParticipleExample(s)
PresentParticiple(seeing)
To show action occurring at the same time as that of the verbWorking on the fundamentals, the team slowly began to improve. [The action expressed by began happened in the past, at the same time the working happened.]
PastParticipleorPresentPerfectParticiple
To show action occurring earlier than that of the verbPrepared by last year's experience, the coach knows not to expect too much. [The action expressed by knows prepared expresses a time prior to that time.]
Having experimented with several game plans, the coaching staff devised a master strategy.
[The present perfect participle having experimented indicates a time prior to the past tense verb, devised.]