单项选择题

Dumped waste might contaminate water supplies.

A. destroy
B. decrease
C. pollute
D. delay
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单项选择题
This poem depicts the beautiful scenery of a town in the South.
A. praises
B. writes
C. describes
D. Imitates
单项选择题
The meaning is still obscure.
A. transparent
B. vague
C. alien
D. significant
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