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小题1:I go to the park            a week.

小题2:You are a            dog.

小题3:I like them very much. They are all my           .

小题4: Kitty can dance           .

小题5: I have a few            in my bag.

编码为HIV包膜gp120的基因是（）

A、gag

B、env

C、pol

D、E6

E、LTR