单项选择题

Don''t_________. I can help you with the typing.

A．matter
B．care
C．worry
D．concern
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单项选择题
There are three colors in the British flag, _________red, white and blue.
A．rarely
B．namely
C．really
D．naturally
单项选择题
At what age are you smartest, sharpest and with the best physical sense, according to the passage
A．From about 15 to 25.
B．Over 30.
C．From 45 to 49.
D．At 60.
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