What is the reseamh at Johns Hopkins University about? Which of the statements is NOT true according to the second paragraph?

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问题 What is the reseamh at Johns Hopkins University about?
Which of the statements is NOT true according to the second paragraph?

选项 A、Crashes of general aviation aircraft are a major source of aviation accidents in the United States.
B、Male pilots, like male vehicle drivers, are more likely to have accidents than female pilots.
C、It is commonly known that aircraft crashes are mostly caused by young and inex- perienced pilots.
D、Only mature pilots are studied to determine the gender differences in the reasons for aircraft crash.

答案D

解析 A是正确的,因为85%的飞行事故死亡人数是专用航空造成的。B是第2段第3句所表达的意思,C是第2段最后一句的原因状语从句的意思。D是正确选项,因为第2段最后一句的意思是,研究人员为确定性别和坠机原因的关系,将主要研究对象设定为40~63岁的熟练飞行员。
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