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

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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
单项选择题
The Food and Drug Administration is a federal agency responsible for （）laws designed to protect purity and safety of food and drugs.

A. enforcing
B. enhancing
C. endowing
D. entailing
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