单项选择题

He tried to avoid the barrier to his carrying out the plan.

A. root
B. obstacle
C. danger
D. advantage
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The stain on his shirt is sure not to vanish.
A. disappear
B. appear
C. mix
D. blend
单项选择题
When the heat accumulates in the room, it will become so hot.
A. elects
B. collects
C. selects
D. reflects
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