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半导体的导电和导体的导电的区别？

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N型半导体和P型半导体有什么区别？

简笔器物表现最适合的角度是和。

Climate change may be a big problem, but there are many little things we can do ______.

A. making a difference
B. to make a difference
C. made a difference
D. make a difference

One of the ways ______ the amount of greenhouse gases that we put into the air is to buy products that don't use as much energy.

A. reducing
B. to be reduced
C. reduced
D. to reduce