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

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

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问题 Heart disease takes up about ______ of the in-flight medical emergencies on US flights.
According to the passage, why does deep venous thrombosis usually happen?
选项 A、Because the economy class is not spacious enough.
B、Because there are too many economy-class passengers.
C、Because passengers are not allowed to walk during the flight.
D、Because the low pressure in the cabin prevents blood flowing smoothly.
答案A
解析 第3段末句建议乘客有机会就多运动或伸展腿部，由此可以推断该段第2句中的cramped表明经济舱的空间狭窄，因此选项A为本题答案。选项B虽然是现实情况，但此项不能从原文推断得出，故不会成为本题的正确原因；第3段末句表明乘客可以离开座位走动，选项C与此矛盾；选项D与题干提到的病症没有直接联系。
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