题目内容

According to the last two paragraphs，what did the previous researchers think about the hu—man eye’s light—sensing system？

A. The human eye had two light—sensing systems．
B. The human eye had one light—sensing system．
C. The human eye could sense the light of day more quickly than the dark of night．
D. The human eye could reset our internal clocks in accordance with the alarm clocks．

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靖在第_____处填上正确答案。

A. selects
B. completes
C. uses
D. tests

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靖在第_____处填上正确答案。

A. space
B. locations
C. instructions
D. time

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In the third paragraph the author wants to tell the reader that_________．

A. it is natural for teenagers to stay up late and get up late
B. staying up late has a bad effect on teenagers’ability to think and learn
C. during puberty most teenagers experience a kind of gray cloud
D. it is hard for teenagers to get out of bed in the morning

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靖在第_____处填上正确答案。

A. another
B. other
C. each other
D. one another

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According to the last two paragraphs，what did the previous researchers think about the hu—man eye’s light—sensing system？

A. The human eye had two light—sensing systems． B. The human eye had one light—sensing system． C. The human eye could sense the light of day more quickly than the dark of night． D. The human eye could reset our internal clocks in accordance with the alarm clocks．

靖在第_____处填上正确答案。

靖在第_____处填上正确答案。

In the third paragraph the author wants to tell the reader that_________．

靖在第_____处填上正确答案。

A. The human eye had two light—sensing systems．
B. The human eye had one light—sensing system．
C. The human eye could sense the light of day more quickly than the dark of night．
D. The human eye could reset our internal clocks in accordance with the alarm clocks．