单项选择题

As a （）major, he enjoyed working in the steel plant.

A. metallurgy
B. geology
C. astronomy
D. seismology

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单项选择题
His career ______ in his appointment as director.
A. contaminated
B. culminated
C. contracted
D. contacted
单项选择题
The jet quickly （）into the sky and soon went out of our view.

A. ascended
B. launched
C. assessed
D. descended
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