【答案与解析】

 

1. Y与文章第一句话吻合。Every living thing has an inner biological clock that controls behavior.

2. N根据第二段的第三和第四句话，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 是不确切的。

3. Y第五段最后两句话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.与题目相符。

4. N根据文章第七段第四句话，She entered the laboratory on June 13th and stayed for 25 days. 由此我们可以推算出她离开的时间是on July 7th。

5. Y本句意思为哈佛教授在人脑中发现一些计时细胞，从文章中第八段第一、二句可看出答案是正确的：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. 只是说明在即使在人们看不到光的时候或是不清楚时间的情况下，生物钟仍然是工作的，不一定就非得由白天变成晚上的情况，因此题目是不确切的，我们可以说continue working even when daylight is shut out.

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

circadian rhythms
根据第四段中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.