2. 外语
  3. Young horses may develop a______ cough before and during exercise, particularly when cold air is breathed in during warming-up e

Young horses may develop a______ cough before and during exercise, particularly when cold air is breathed in during warming-up e

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问题 Young horses may develop a______ cough before and during exercise, particularly when cold air is breathed in during warming-up exercise or under dusty conditions.
选项 A、perpetual
B、permanent
C、chronic
D、sustained
答案C
解析 近形近义题。chronic 意为“慢性的；长期的”，强调延续时间长的，如a chronic disease(慢性病)； [A] perpetual “永久的；不断的”．强调稳定性和持久性；[B]permanent“永久的；不变的”，指总是处于相同的情况和地位，可长期持续下去，永久不变；[D]sustained“持续不变的；不间断的”。
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大学英语六级

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