What was regarded as a watershed event
A.A 1956 mid-air collision.
B.The JetBtue incident.
C.Two pilots trying to explore the limits of theirplanE.
D.An Egyptian plane crashing into the Atlantic Ocean.

A.A
B.
B.The
C.Two
D.
D.An
E.

【参考答案】

A
线索词：watershedevent定位处：文章第十二段。解析：根据线索词可定位到第十二段，但要了解事故的前......

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