划线提问(the fish)swim faster than the duck用wwhat animal还是which animal

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划线提问(the fish)swim faster than the duck
用wwhat animal还是which animal

which animal swim faster,the fish or the duck?
这里有两种动物,所以用which提问
what 一般是在不知道是什么东西的情况下来提问的.

what animal