单项选择题

The attack of the World Trade Center will leave a ______ impression on those who have witnessed the explosion.

A．long
B．forever
C．lasting
D．lively
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单项选择题
______ is the question of using existing resources to produce original and beneficial solutions, ideas or products.
A．Creatioity
B．Productivity
C．Application
D．Combination
单项选择题
Mercury orbits the Sun in 88 Earth days at an average speed of 48 kilometres per second, allowing it to overtake Earth every 116 Earth days.
A．precipitate
B．stimulate
C．overhaul
D．rotate
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