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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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
单项选择题
Auto makers are required to（）with the standards of exhaust control by improving their engines, styles, bumpers, brakes, steering wheels and seats.

A. conform
B. submit
C. comply
D. abide
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