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【题目】The tiger is at the top of the food chain. It helps keep the number of other wild animals________.

A.in balanceB.in secondsC.in totalD.in common

【答案】A

【解析】

句意:老虎在食物链的顶端,它有助于保持其他野生动物的数量平衡。

考查介词短语。in balance平衡地;in seconds在很短的时间;in total总共;in common一样。根据题意,“保持数量平衡”,故选in balance,介词短语作宾语补足语。故选A

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