单项选择题

Which is true according to the speaker

A. It is difficult to find out how the brain works.
B. After an arm is cut off, the doctors cannot put it back.
C. We should stop studying the brain because it is so dangerous.
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单项选择题
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What should the transportation be like in their opinion
A. There should be fewer subway lines.
B. There should be more public transportation.
C. There should be more cars.
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