The bird watchers were on the ______ for the rare species.A.alterB.alertC.alikeD.altar
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The bird watchers were on the ______ for the rare species.
A.alter
B.alert
C.alike
D.altar
请帮忙给出正确答案和分析,谢谢!
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正确答案:B
形近异义词题。onthealertfor表示“警戒,防备”,符合句子语境,故B正确。alter表示“改变”;alike表示“相同的,相似的”;altar表示“祭坛”。
