单项选择题

Beck thinks it is ____________ for the government to set a base price.

A．helpful
B．reasonable
C．wrong
D．necessary
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单项选择题
Which of the following is true according to the report
A．The spacecraft will fly direct to Mercury.
B．The spacecraft will fly three times past Mercury.
C．The spacecraft was launched a week later than planned.
D．There is no specific task for this journey.
填空题
highway system
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