单项选择题

My father is a physician.

A. researcher
B. professor
C. doctor
D. student
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单项选择题
Dumped waste might contaminate water supplies.
A. destroy
B. decrease
C. pollute
D. delay
单项选择题
The board of the company has decided to widen its operation to include all aspects of the clothing business.
A. extend
B. enlarge
C. expand
D. amplify
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