单项选择题

The suggestion that the mayor ______ the prizes was accepted by everyone.

A．would present
B．present
C．presents
D．ought to present
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单项选择题
Few airlines want to impose a total ban on their passengers using electronic devices because______.
A．they don't believe there is such a danger as radio interference
B．the harmful effect of electromagnetic interference is yet to be proved
C．most passengers refuse to take a plane which bans the use of radio and cassette players
D．they have other effective safety measures to fall back on
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 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.
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