单项选择题

Many factory workers find their jobs tiresome.

A. difficult
B. pointless
C. profitable
D. boring
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The scientists are exploring the area in hopes of finding new stores of underground oil, which can serve as an outlet for the energy crisis.
A. styles
B. varieties
C. supplies
D. shops
单项选择题
The commercial telephone service was no longer operative.
A. creative
B. moving
C. rotating
D. working
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