Stock farmers must be______to the possible reoccurrence of foot-and-mouth disease that has already killed millions of pigs and c

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问题 Stock farmers must be______to the possible reoccurrence of foot-and-mouth disease that has already killed millions of pigs and cows in East Asia.

选项 A、observable
B、apparent
C、alert
D、marked

答案C

解析 词汇:形容词1.这是一道词汇题,选项均为形容词。2.空格后提到口蹄疫复发,符合这一语境的为alert,意为“警戒”。
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