单项选择题

Various regulations, such as import controls and tariffs, ______ free trade between the two countries.

A．restrict
B．accommodate
C．gratify
D．endure
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It can be difficult to ______ the various factors that contribute to a new venture's failure.
A．retain
B．polish
C．isolate
D．deviate
单项选择题
The prevailing westerly wind should ensure that Montoba Air flight 675 lands at Los Angeles International Airport ______ schedule.
A．down
B．aboard
C．ahead of
D．next to
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