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问题 单项选择题

胎儿身长增长最快是

A．孕前2周

B．孕0～12周

C．孕13～27周

D．孕28～42周

E．孕＞42周

答案

参考答案：C

判断题

如果两种股票的相关系数ρ＜1.0，则这两种股票即使通过组合，也不能达到分散风险的目的。 ( )
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选择题
—There are thousands of foreigners living in Jiaxing now.
—Yes, but much fewer before. There were only ______ them.

A. hundreds of
B. thousands of
C. millions of
D. billions of
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