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[听力原文] Kindergarten students are typically four or five yea......

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单项选择题
The passage is mainly about______.
A．a new regulation for all airlines
B．the defects of electronic devices
C．a possible cause of aircraft crashes
D．effective safety measures for air flight
单项选择题
What is said about the over 100 aircraft incidents in the past 15 years
A．They may have been caused by the damage to 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.
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