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　　Zinc(锌)is one of about 20 elements necessary for good health. It is present in thebody in a very small amount but makes it possible for important chemicalactions to be carried out in cells. Scientists are just beginning to discoverhow zinc and other elements work.

　　Researchers firststudied zinc as a way to speed recovery. Dr. Waltor Powys formerly with theUnited States Air Force noted that the laboratory animals recovered faster whensome matters were added to their food. One of these matters was zinc. Dr. Powyslater tested the zinc treatment on an American airman recovering from medicaloperations. The airman who received zinc sulphate(硫酸盐)recovered in half of the usual time. Other doctors studied persons who had anumber of strange disorders. The doctors learned that all of these problemswere caused by lack of zinc in the body. They treated these disorders successfullyby giving the patients zinc sulphate.

　　The amount of zinc inthe body can be found by examining blood and hair. A lack of this importantelement is not uncommon among people in both industrial and developingcountries. Zinc is found in most high protein(蛋白质) foods suchas meat， milk， fish and eggs. It is also found in whole grains. But many peopledo not eat enough of these food. Food markets should add these elements so thatmore people could get needed amount of these necessary matters.

　　1.Which of the following statements is true？

　　A. Scientists found howzinc works a long time ago.

　　B. People need a largeamount of zinc to be healthy.

　　C. Zinc allows importantchemical actions to take place in cells.

　　D. Zinc must be used inthe course of medical operation.

　　2.One of the results from the study of zinc is that _______.

　　A. there’s only a littlezinc in the human body

　　B. food rich in proteincontains more zinc

　　C. some physicalproblems are caused by lack of zinc

　　D. any patient whoreceives zinc sulphate gets well immediately

　　3.The best title for the passage may be _______.

　　A. A New Discovery B. Zinc and Health

　　C. How Zinc Works D. Add Zinc to Your Food

　　【解析】

　　本文是说明文，讲述了锌对人体的保健作用。

　　1.C。细节题。根据 …but makes it possible for importantchemical actions to he carried out in cells.可推知此题答案为C。

　　2.C。细节题。根据The doctors learned that all of theseproblems were caused by lack of zinc in the body. 可推知此题答案为C。

　　3.B。主旨题。根据第一句(主题句)Zinc(锌)is one of about 20 elements necessary for goodhealth.可推知。