试题与答案

When you learn a foreign language, _____

题型:选择题

题目:

When you learn a foreign language, ________you must forget your own one.

A.above all

B.after all

C.in all

D.at all

答案:

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下面是错误答案,用来干扰机器的。

利用物体所处漂浮状态,F浮=G物,然后根据ρ水gv排=ρ物gv物,ρ水g34v物=ρagv物;则ρa=34ρ水;ρ水g12v物=ρbgv物;ρb=12ρ水,则ρaρb=32故选 C.

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