单项选择题

Not having a good command of English can be a serious ______ preventing you from achieving your goals.

A．obstacle
B．fault
C．offense
D．distress
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单项选择题
The rapid development of communications technology is transforming the ______ in which people communicate across time and space.
A．route
B．transmission
C．vision
D．manner
单项选择题
He is at ______ in his description of country life.
A．better
B．best
C．his better
D．his best
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