单项选择题

Unlike the common cold, flu tends to start abruptly.

A．mysteriously
B．seasonally
C．repeatedly
D．suddenly
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单项选择题
Poor children should not be deprived of the opportunity to participate in sports whenever possible.
A．denied
B．retreated
C．oppressed
D．refused
单项选择题
As an assistant in a shop, she tries to be courteous at all times, even when she is very tired.
A．straightforward
B．polite
C．flexible
D．neat
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