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问题 单项选择题

血钙降低常见于（）

A.原发性甲状腺功能亢进

B.佝偻病

C.维生素D摄入过多

D.急性肾衰竭

E.恶性肿瘤骨转移

答案

参考答案：B

选择题

下列各种元素，在自然界中无游离态的是（ ）

A．氧

B．氮

C．钠

D．碳
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单项选择题

Which of the following statements is true according to what you hear

What conclusions can you make about the people in New York City

A．You can’t please anyone in New York City.
B．They don’t like to recycle their trash.
C．Mayor Bloomberg always turns a deaf ear to people’s complaints.
D．People want to have their trash collected more frequently.
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