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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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
单项选择题
Which of the following can be inferred about the first trumpet players
A．They could not play all the notes of the scale.
B．They were not able to pick up the trumpet.
C．They could not play simple tunes.
D．They had difficulty improving upon the trumpet.
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