单项选择题

Tile 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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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
单项选择题
Dr. Tichauer started his experiments initially to______.
A．improve efficiency
B．increase production
C．reduce work load
D．improve comfort
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