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

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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