Zinc(锌)isoneofabout20elements(元素)necessaryforgoodhealth...

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Zinc(锌) is one of about 20 elements(元素) necessary for good health. It is present in the body in a very small amount, But it makes it possible for important chemical actions to be carried out in cells. Scientists are just beginning to discover how zinc and other elements work.

Researchers first studied zinc as a way to speed recovery. Dr. Waltor Powys formerly with the United States Air Force, noted that the laboratory animals recovered faster when some matters were added to their food. One of these matters was zinc. Dr. Powys later tested the zinc treatment on an American airman recovering from medical operations. The airman who received zinc sulphate(硫*锌) recovered in half of the usual time. Other doctors studied persons who had a number of strange disorders. The doctors learned that all of these problems were caused by lack of zinc in the body. They treated these disorders successfully by giving the patients zinc sulphate.

The amount of zinc in the body can be found by examining blood and hair. A lack of this important element is not uncommon among people in both industrial and developing countries. Zinc is found in most high protein(蛋白质) foods such as meat, milk, fish and eggs. It is also found in whole grains. But many people do not eat enough of these food. Food markets should add these elements so that more people could get needed amount of these necessary matters.

1．One of the functions of zinc is that it can ________.

A．make people's bones stronger

B．help people recover faster

C．be good for people's memory

D．change people's sleep for the better

2．How can the amount of zinc in the body found?

A．by examining blood and hair.

B．by checking tears and sweat.

C．by taking people's temperatures.

D．by testing people's blood pressure.

3．To get enough zinc, people should eat foods that contain ________.

A．a lot of fibre B．high fat