2. 外语
  3. The bird watchers were on the ______ for the rare species.

The bird watchers were on the ______ for the rare species.

admin2015-03-26  9
问题 The bird watchers were on the ______ for the rare species.
选项 A、alter
B、alert
C、alike
D、altar
答案B
解析 形近异义词题。on the alert for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”。
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