Question

One way that scientists (科学家) learn about man is by studying animals．In this lab, the scientists are studying the relationship between diet and health．

They are studying the relationship between the amount (数量) of food the mice eat and their health．The mice are in three groups．All three groups are receiving the same healthy food．The first group is eating one cup of food each day, the second group is eating two cups, and the third group is eating three cups．

After three years, the healthiest group is the one that is only eating one cup of food each day．The mice in this group are a little thinner. But they are more active．Most of the day, they are running, playing with one another．Also, they are living longer．Mice usually live for two years．Most of the mice in this group are still alive after three years．

The second group of mice is healthy, too．They are active, but not as active as the thinner mice．They are only living about two years．

The last group of mice is receiving more food than the other two groups．Most of the day, these mice are eating or sleeping．They are not very active．These mice are living longer than the scientists thought－about a year and a half．But they are not healthy．They are sick more often than the other two groups．

1.People give each group of the mice _______ amount of food every year.

A. a different   B. the same

C. a small        D. a large

2.The experiment (实验) lasted for at least _______ years．

A. one and a half     B. two

C. two and a half       D. three

3.The underlined word “they” in the second paragraph refers to _______.

A. the scientists

B. the mice in the first group

C. all the mice

D. the mice in the last group

4.The best title for the passage is ________．

A. Man and health              B. Diet and animals

C. Diet and health            D. Animals and human beings

5.The result of the experiment mainly shows that ________．

A. eating less may bring longer life

B. the mice eat more than the scientists thought

C. the mice live longer than the scientists thought

D. the more exercise you take, the healthier you will be

Answer

1.A

2.D

3.B

4.C

5.A

【解析】

试题分析：这篇短文讲述的是科学家们用老鼠做实验，研究饮食与健康之间的关系。科学家们把老鼠分成三组，每组给他们不同量的食物，三年后得出实验结果，证明吃得少可能导致长寿。

1.A细节理解题。根据短文第二段中All three groups are receiving the same healthy food．The first group is eating one cup of food each day, the second group is eating two cups, and the third group is eating three cups可知，科学家们把实验用的老鼠分成三组，分别给他们不同量的食物。由此可知应选A。

2.D推理判断题。根据短文第三段中After three years, the healthiest group is the one that...可知，三年后，观察实验的结果，由此可推断这个实验持续了大约三年的时间，故应选D。

3.B词义猜测题。根据划线单词所在的上文After three years, the healthiest group is the one that is only eating one cup of food each day．The mice in this group are a little thinner. But they are more active可知，they代指的是在实验中最健康的那一组老鼠，也就是每天吃一杯食物的第一组老鼠。故应选B。

4.C主旨大意题。这篇短文给我们介绍了科学家们做的一个实验，他们用老鼠做实验，为的是研究饮食和健康之间的关系，根据第一段的最后一句话In this lab, the scientists are studying the relationship between diet and health可知。因此C选项Diet and health这个题目可以概括短文的大意，故应选C。

5.

考点：科普类短文阅读。