单项选择题

A. You are welcome. B. I’m very busy.
C. Of course. D. That doesn’t matter.
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Vitamin D is important for health and (11) . It is used by the body to form strong bones and teeth. That is why growing children need it. Vitamin D is called the (12) vitamin. It forms when the skin is bared to the sun. Long before people knew what vitamin D was, they learned that sunshine was important. Poor children lived in (13) slums. And they were often ill with rickets (软骨病). Rickets is a children’s disease caused by (14) vitamin D provided by sunshine, fresh milk, etc. It makes the bones become (15) and bent. In England a tax was once placed on windows. Builders put few windows in houses. Rickets became so common that it was called the English disease.
单项选择题
A. The old coat isn’t worth repairing. B. He can repair the hole in the coat. C. He just saw the woman’s new coat. D. The woman should take something for her cold and sore throat.
A. The old coat isn’t worth repairing.
B. He can repair the hole in the coat.
C. He just saw the woman’s new coat.
D. The woman should take something for her cold and sore throat.
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