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问题 选择题

把30974四舍五入，使其精确到百位，那么所得的近似数是（　　）

A．3.10×105

B．3.10×104

C．3.10×103

D．3.09×105

答案

把30974四舍五入，精确到百位，

所得的近似数是3.10×104．

故选B．

填空题

根据句意，写出划线词的对应词或反义词。

1. His first name is John,and his ______ name is Brown.

2. ______ your pictures here. Take the books there.

3. Linda is my ______, and Clark is my uncle.

4. Ask and ______ these questions.

5. The parents have a son and a ______.
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单项选择题

目前已发现的IGF结合蛋白共有（）

A.7种

B.4种

C.8种

D.6种

E.5种
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