2.What is said about the over 100 aircraft incidents in the past 15 years? A) They may have been caused by the damage to the radio systems. B) They may have taken place during take-off and landing. C) They were proved to have been caused by the passengers portable computers. D) They were suspected to have resulted from electromagnetic interference.

2.What is said about the over 100 aircraft incidents in the past 15 years?
A) They may have been caused by the damage to the radio systems.
B) They may have taken place during take-off and landing.
C) They were proved to have been caused by the passengers portable computers.
D) They were suspected to have resulted from electromagnetic interference.

出自：河南师范大学-小学教育（本科)-大学英语Ⅱ

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