单项选择题

For your own_________, please fasten your belts before the plane takes off.

A．safeguard
B．save
C．safety
D．safener
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单项选择题
This novel is worth reading, because it gives a detailed description of the historical _______ in 1949.
A．accidents
B．cases
C．events
D．things
单项选择题
_________ is quite difficult for Mary to pass the interview.
A．What
B．This
C．That
D．It
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