2. 外语
  3. Heart disease takes up about ______ of the in-flight medical emergencies on US flights. According to the passage, the expansion

Heart disease takes up about ______ of the in-flight medical emergencies on US flights. According to the passage, the expansion

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问题 Heart disease takes up about ______ of the in-flight medical emergencies on US flights.
According to the passage, the expansion of air in body cavities can result in ______.
选项 A、heart attack
B、chest pain
C、stomach cramping
D、difficult breathing
答案C
解析 第2段第4句提到了“体腔内空气膨胀”，接下来三句分别列出了这种现象可能导致的三种病症，其中选项C在第5句提到，为本题答案。选项A引起的原因没有提到；根据第2段第3句，选项B应由血液中含氧量低导致的；选项D在第3段提及，由血栓引起。
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大学英语六级

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