人的精子中有23条染色体，则人的神经细胞、初级精母细胞、卵细胞

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问题选择题

人的精子中有23条染色体，则人的神经细胞、初级精母细胞、卵细胞中分别有染色体多少条[ ]

A．46、23、23

B．46、46、23

C．0、46、0

D．0、46、23

答案

答案：B

选择题

212. We must make sure that all the boxes should__________the owners’ names.

A．write

B．be written

C．mark with

D．be marked with

选择题

Why do you insist on buying a car ______ you have such good public transportation here?

A．because

B．unless

C．when

D．though