which和what的用法区别：当选择范围较小或比较明确时用which，当选择范围较或不明确时用what。

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which和what的用法区别：当选择范围较小或比较明确时用which，当选择范围较或不明确时用what。例如：　Which is bigger, the sun or the earth? 太阳和地球哪个大?What writers do you like? 你喜欢哪些作家?