On May 23,1989，Stefania Follini came out from a cave at Carlsbad，New Mexico.She hadn't seen the sun for eighteen and a half weeks.Stefania was in a research program，and the scientists in the program were studying body rhythms(節(jié)奏)．In this experiment Stefania had spent 130 days in a cave,30 feet in depth.

During her time in the cave，Stefania had been completely alone except for two white mice.Her living place had been very comfortable，but there had been nothing to tell her the time.She'd had no clocks or watches，no television or radio.There had been no natural light and the temperature had always been kept at 21℃.

The results were very interesting.Stefania had been in the cave for over four months，but she thought she had been there for only two.Her body clock had changed.She hadn't kept to a 24­hour day，she had stayed awake for 20～25 hours and then had slept for 10 hours.She had eaten fewer meals and had lost 171 bs in weight as a result！She had also become rather depressed(抑郁)．

How had she spent her time in the cave？As part of the experiment she'd done some physical and mental tests.She'd recorded her daily activities and the results of the tests on a computer.This computer had been specially programmed for the project.Whenever she was free，she'd played cards，read books and listened to music.She'd also learned French from tapes.

The experiment showed that our body clocks are affected by light and temperature.For example，the pattern of day and night makes us wake up and go to sleep.However，people are affected in different ways.Some people wake up naturally at 5：00 am，but others don't start to wake up till 9：00 or 10：00 am.This affects the whole daily rhythm.As a result，the early risers are at their best in the late morning.The late risers, on the other hand，are tired during the day and only come to life in the afternoon or evening!

68．Stefania stayed in the cave for a long time because________.

A．she was asked to do research on mice

B．she wanted to experience loneliness

C．she was the subject of a study

D．she needed to record her life

69．What is a cause for the change of Stefania's body clock?

A．Eating fewer meals.

B．Having more hours of sleep.

C．Lacking physical exercise.

D．Getting no natural light.

70．Where does the text probably come from ?

A．A novel.         B．A news story.

C．A pet magazine.      D．A travel guide.

解析:細(xì)節(jié)理解題。根據(jù)第一段后兩句話可知，Stefania參加了一個實驗項目，她在30英尺深的洞穴里生活了130天；第三段介紹了實驗的結(jié)果。由此可以看出Stefania是這項研究的實驗對象。故選C項。

答案:C

解析:細(xì)節(jié)理解題。最后一段首句說明，人體的生物鐘受光和溫度的影響；第二段末句說明在洞穴里沒有自然光，溫度保持在21℃。由此可推斷答案為D項，Stefania身體生物鐘的改變是由于接受不到自然光。

答案:D

解析:推理判斷題。從全文內(nèi)容看，本文報道了1989年進行的一項研究實驗，所以應(yīng)該選自A news story，即新聞故事。

答案:B

 

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