单项选择题

The recycling of aluminum conserves ninety-five percent of the energy needed to make new metal().

A.cleaning
B. reprocessing
C. reselling
D. crushing

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单项选择题
It took me a whole hour to solve the problem.()

A.work at
B. work on
C. work out
D. work over
单项选择题
In the Mesozoic period, the upward thrust of great rock masses created the Rocky Mountains and the Alps().

A.collision
B. angle
C. push
D. erosion
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