【答案與解析】

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1. Y與文章第一句話吻合。Every living thing has an inner biological clock that controls behavior.

2. N根據第二段的第三和第四句話，原文中是he noted that one of his plants opened its leaves at the same time every morning, and closed them at the same time every night. The plant did this even when he kept it in a dark place all the time. 可以看出in the sun 是不確切的。

3. Y第五段最后兩句話It contains computers, one-way cameras and other electronic devices for observing the person in the living area. The instruments measure heartbeat, body temperature, hormones in the blood, other substances in the urine and brain waves during sleep.與題目相符。

4. N根據文章第七段第四句話，She entered the laboratory on June 13th and stayed for 25 days. 由此我們可以推算出她離開的時間是on July 7th。

5. Y本句意思為哈佛教授在人腦中發(fā)現一些計時細胞，從文章中第八段第一、二句可看出答案是正確的：Scientists have discovered a tiny group of cells in the brain that act as a clock to control many bodily activities.The discovery was made by doctors at Harvard University.

6. N在文章的最后一段中，The scientists say the clocks in the brain seem to work even when a person cannot see daylight or any other evidence of what time it is. 只是說明在即使在人們看不到光的時候或是不清楚時間的情況下，生物鐘仍然是工作的，不一定就非得由白天變成晚上的情況，因此題目是不確切的，我們可以說continue working even when daylight is shut out.

7. Y第八段第一句話，Scientists have discovered a tiny group of cells in the brain that act as a clock to control many bodily activities.

circadian rhythms
根據第四段中They are free to listen to and live by their circadian rhythms.可以得出答案。

the optic nerves
第十四段中The scientists believe the cells above the optic nerves are only one of two biological clocks in the brain.

controlled the timing of activities
第九段中They destroyed the tiny group of brain cells which they believed controlled the timing of activities.

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