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

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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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