单项选择题

Those countries were once worried that they would not have adequate supplies ofpetroleum.

A. effective
B. efficient
C. potential
D. sufficient
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He must not allow this unusual barrier to stop him from fighting against the enemy.
A. interior
B. obstacle
C. innocence
D. advantage
单项选择题
Medicine depends on other fields for basic information, particularly some of their specialized branches.
A. conventionally
B. obviously
C. especially
D. clearly
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