Zinc(锌) is one of about 20 elements 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 substances were added to their food. One of these substances was zinc. Dr. Powys later tested the zinc treatment on an American airman recovering form medical operations. The airman who received zinc sulphate (硫酸盐) recovered in one half the usual time. Other doctors studied persons who had number of strange disorders. They treated these disorders successfully by giving the patients zinc sulphate.
The amount of zinc in the body’ can found by examining the blood and hair. A lack of this important element i
A. unprocessed
B. processed
C. various kinds of
D. for the effect that
Zinc(锌) is one of about 20 elements 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 substances were added to their food. One of these substances was zinc. Dr. Powys later tested the zinc treatment on an American airman recovering form medical operations. The airman who received zinc sulphate (硫酸盐) recovered in one half the usual time. Other doctors studied persons who had number of strange disorders. They treated these disorders successfully by giving the patients zinc sulphate.
The amount of zinc in the body’ can found by examining the blood and hair. A lack of this important element i
A. since
B. therefore
C. for the purpose that
D. for the effect that
About one in twenty adults in the United States cannot read English. A new federal study shows that adults made little progress in their reading skills between 1992 and 2003.
The National Assessment of Adult Literacy is the most important test of how well adult Americans can read. Researchers tested nineteen thousand people over the age of sixteen. The study represents an adult population of two hundred twenty-two million. Those who took part were tested on how well they could read and understand information used in everyday life, The study found that eleven million adults, or five percent, cannot read English. They could not answer even the easiest written questions. Four million of them most likely cannot speak English either. The study shows that more than forty percent of adults can perform only simple reading activities. For many, even that can be difficult. Fifty-six percent of adults can perform moderate or complex activities. Moderate can mean finding info
A. A little bit more than seven percent.
B. Fifty-six percent.
C. More than forty percent.
D. Thirteen percent.
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