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问题 单项选择题

根据nev基因序列的异同，HIV-1的亚型有

A．8

B．7

C．4

D．6

E．5

答案

参考答案：A

选择题
If he had spent more time practising speaking English before，he________able to speak it much better now.                                                   
A．will beB．would be
C．has beenD．would have been
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单项选择题

铺床时移椅至床尾正中离床约为（）

A.10cm

B.15cm

C.20cm

D.5cm
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