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A．based on
B．basing on
C．being based on
D．having based on
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单项选择题A．wellB．goodC．fastD．better

A．well
B．good
C．fast
D．better

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.