单项选择题

It can be inferred from the passage that ______ is needed to make the trumpet work.

A．air pressure
B．keen eyesight
C．daily cleaning
D．long fingers
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单项选择题
In the last paragraph, the word one could best be replaced by ______.
A．the composer
B．an instrument
C．a family
D．the listener
单项选择题
What is the best title for the passage
A．Science and the Trumpet
B．Recordings of the Trumpet
C．The Trumpet and Its Ancestry
D．How the Trumpet is Made
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