单项选择题

There is no direct flight, so I flew to Pittsburgh（）Philadelphi

A. amid
B. via
C. across
D. past

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The most ______ students do additional reading to supplement the material in the textbook.
A．gifted
B．sensitive
C．proficient
D．diligent
单项选择题
We have no time to lose. Let's ______ on the task before us.
A．enter
B．impose
C．concentrate
D．overwork
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