单项选择题

It can be inferred from the passage that which of the following is needed to make the trumpet work

A．Air pressure.
B．Daily cleaning.
C．Keen eyesight.
D．Longer fingers.
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She often says her greatest happiness ______ serving the handicapped children.
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B．consists in
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The author believes that the trumpet is particularly important because it ______.
A．can be used in rock bands
B．has historical significance
C．is a religious instrument
D．has a narrow range
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