单项选择题

The expert used a picture to give out the illusation.

A. lesson
B. explanation
C. practice
D. show
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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
单项选择题
He must not allow this unusual barrier to stop him from fighting against the enemy.
A. interior
B. obstacle
C. innocence
D. advantage
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