单项选择题

The（）of the town is not good, some of the pipes being broken.

A. drainage
B. charity
C. vegetation
D. nutrition

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单项选择题
The less sophisticated microwave receivers can receive microwave TV signals from satellites and transform them into TV signals（）with the present TV sets.

A. compatible
B. susceptible
C. negligible
D. permissible
单项选择题
Before one new drug is put into the market, it is first used on healthy volunteers to（）that the drug is safe for further use.

A. ascertain
B. declare
C. announce
D. preach
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