单项选择题

It can be inferred from the passage that in order to make the trump work, ______ is needed.

A．air pressure
B．daily cleaning
C．keen eyesight
D．long fingers
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单项选择题
Which of the following is NOT true about the trumpet
A．It has a long history.
B．It has a large family.
C．It produces a beautiful tone.
D．It is the most popular musical instrument.
单项选择题
A．thingsB．everythingC．anythingD．thing
A．things
B．everything
C．anything
D．thing
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