【題目】As we all know, birds are the natural ________(enemy) of many insect pests.

【答案】enemies

【解析】

句意為：眾所周知，鳥類是許多害蟲的天敵。根據(jù)are可知此處應(yīng)填名詞復(fù)數(shù)。故填enemies。

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