单项选择题

One of the biggest______to the economic reform of this area has been the lack of access to international markets.

A．prophecies
B．transactions
C．arguments
D．hindrances
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单项选择题
One of the responsibilities of the Coast Guard is to make sure that all ships______follow traffic rules in busy harbors.
A．dutifully
B．cautiously
C．faithfully
D．skillfully
单项选择题
Some scientists are dubious of the claim mat organisms______with age as an inevitable outcome of living.
A．depress
B．default
C．degrade
D．deteriorate
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