What is NOT the dark side of the dependence on fossil fuels and nucle

Last year was the first in which low-carbon sources of electricity eclipsed those based on fossil fuels burned in the UK. Wind, solar, nuclear power and imports supplied 48.5 percent of electricity, while 43 percent came from UK coal and gas power plants. In 1990, three-quarters of power in the UK came from fossil fuels.

4. Which is the best title for the text?

选项： A:

UK electric power going green

B:

Use of fossil fuels in the UK going down

C:

Renewable energy booming in the UK

D:

Reduction of carbon emissions in the UK

20.People are beginning to use clean energy sources mainly because _______. 选项：fossil fuels have caused a lot of pollution|clean energy is cheap|fossil fuels have cost a lot of lives|they do not have enough fossil fuels now