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- Many companies and scientists are trying to develop better ways of using existing energy sources.
Question 1:
Many companies and scientists are trying to develop better ways of using existing energy sources. For example, they*^*want to develop new machines that can do twice the work using only half of the energy amount that was once used.*^*This is called improving energy ........*^* A. spaces
B. correction
C. efficiency
D. _
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