Heart disease takes up about ______ of the in-flight medical emergencies on US f

游客2024-06-16 46

问题 Heart disease takes up about ______ of the in-flight medical emergencies on US flights. [br] 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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