连词组句。

1. are, what, doing, you (?)

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2. I, help, may, you (?)

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3. do, have, you, books, many, how (?)

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4. don't, I, like, those, pants (.)

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经检验合格的进口汽车，由口岸检验检疫机构一车一单签发( )。

A．入境货物通关单

B．入境货物检验检疫证明

C．进口机动车辆随车检验单

D．进口机动车辆检验证明