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147. From which do plants on the earth get energy?
Almost all our energy comes from oil, coal, and natural gas. What will happen when these fossil fuels are running out?

Scientists are trying to find and use other alternative sources of energy. We can use energy from the sun, the wind, and the water. Solar energy is limited. The sun supplies all the energy for rain and to maintain the temperature of the earth. If we are able to collect solar energy, we will be sure to have this abundant source of power.

148. What are the other words or phrases for fossil fuels?
A. natural gas
B. oil
C. coal

149. Natural sources of energy are energy from
A. wind
B. the sun

150. The word "abundant" in the passage is closest in meaning with
A. plentiful
B. limited

151. We are asking the question, “What will happen when there is no oil, coal, and gas on the earth?”
D. we are looking for other alternative sources of energy