'Why is called a .... source ?" _ " Because it can be replaced easily and quickly."
A. Effective B. specific C. renewable D. non-renewable
Fossil fuels are very common in our society but they .... the environment.
A. renew B. provide C. waste D. pollute
The wind, the sun and the wave are some types of .... sources of energy.
A. changeable B. alternative C. cheap D. costly
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Sinh Học lớp 12
