题目内容

Electronic devices are allowed to be turned on during flight probably because______.

A. they have no interference with plane"s communications
B. they are necessary devices to some passengers
C. the reason to switch them off is different from that of cell-phone
D. the interference they bring doesn"t last long

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All of the following is prohibited during takeoff and landings except______.

A. electronic book
B. MP5
C. tablet computer
D. brain pacemaker

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