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
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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
单项选择题
Sometimes artists find it hard for their works to win popular ______.
A．welcome
B．applause
C．appetite
D．appreciation
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