单项选择题

幼儿( )、( )月龄时，应分别至少查一次血常规。

A.17、20
B.18、20
C.18、30
D.17、30

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B: I______that. Millions of people are addicted to them!
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B. wouldn't say
C. 'd never thought of
D. agree with

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下列哪种细胞属于多倍体细胞

A.原始粒细胞
B．原始单核细胞
C．原始淋巴细胞
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