2. 外语
  3. Malaria is an infectious parasitic disease that can be either acute or chronic and is frequently____.

Malaria is an infectious parasitic disease that can be either acute or chronic and is frequently____.

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问题 Malaria is an infectious parasitic disease that can be either acute or chronic and is frequently____.
选项 A、repeating
B、terminal
C、debilitating
D、recurrent
答案D
解析 本题空格处是说经常复发。D项的recurrent“复发的”符合题意。其他三项repeating“重复的”；terminal“末期的”；debilitating“衰弱”都不正确。
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