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Scientists did tests on mice. They showed that fasting(禁食) can be healthy. Fasting is eating little or nothing for a day or two. Scientists found that fasting can lower the risk of diabetes, heart disease, cancer and other diseases. The scientists gave the mice low-calorie food for four days. They then gave the mice just 10% of their normal food for three days. This made the pancreas(胰腺) in the mice work better.

The pancreas makes insulin(胰岛素) in our body. Insulin breaks down(分解) sugar in the blood. People with diabetes have too much sugar in the blood. They have health problems and it can be deadly(致命的). People with diabetes do not produce any insulin or do not produce enough. Scientists said fasting made more insulin. They now want to do the tests on humans.

1.What does scientists show by tests?

A They show that fasting can be tiring.

B They show that fasting can be hungry.

C They show that fasting can be healthy.

D They show that fasting can be deadly.

解析：选C。细节理解题。根据第一段第二句They showed that fasting can be healthy.可知，故选C。

2.Fasting is eating ______.

A little for a day or two

B nothing for a day or two

C little or nothing for a year

D little or nothing for one or two days

解析：选D。细节理解题。根据第一段第三句Fasting is eating little or nothing for a day or two.可知，故选D。

3.What’s the result of fasting tests on mice?

A Fasting made the pancreas in the mice much more.

B Fasting made the pancreas in the mice work better.

C Fasting made the pancreas in the mice work worse.

D Fasting made the pancreas in the mice less.

解析：选B。细节理解题。根据第一段最后一句This made the pancreas in the mice work better.可知，故选B。

4.What’s the function of insulin?

A It breaks down cells in the blood.

B It breaks down sugar in the blood.

C It makes brain cleverer.

D It makes blood work well.

解析：选B。细节理解题。根据第二段第二句Insulin breaks down sugar in the blood.可知，故选B。