单项选择题

The price of this machine is not reasonable.()

A.helpful
B. kind
C. fair
D. effective

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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

单项选择题

The behavior is stemmed from his ide()

A. flows
B. comes
C. watches
D. observe

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