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单选题

A．Why species don't avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren't extinct.
D．How many species aren't extinct.

参考答案A

解析:暂无解析

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单选题

A．Because every species becomes extinct.
B．Because humans beings are powerful enough to kill other species.
C．Because of over-population.
D．Because human being is still a young species though it is exploiting the environment.

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单选题

A．He thinks flies will take over the earth.
B．He thinks human will die off quite soon.
C．He thinks mass disease could be the next path to extinction.
D．He sees human beings as destructive.

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单选题 Section B
Directions: In this section, you will hear two passages. At the end of each passage, you will hear three or four questions. Both the passage and the questions will be spoken only once. After you hear a question,you must choose the best answer from the four choices marked A, B, C and D. Then mark the corresponding letter on Answer Sheet I with a single line through the centre.
Questions 9 to 11 are based on the passage you have just heard.

A．A part of the free MIT OpenCourseWare.
B．A free computer programme by MIT and Harvard.
C．A Harvard-MIT platform of free online courses.
D．A free programme online for universities worldwide.

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