题目内容

Politicians and big companies believe ______ are alternative sources of energy

A. solar energy
B. wind power
C. farm-grown fuels
D. dark fuels

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Brazil is the world’s second largest producer of ______.

A. biofuel
B. fossil fuel
C. corn fuel
D. ethanol fuel

The Amazon is a moist broadleaf forest that covers most of the Amazon basin of _______.

A. North America
B. South America
C. South Asia
D. North Asia

A biofuel is a fuel that is produced through contemporary _______ processes, rather than a fuel produced by _______ processes.

A. " biological; geological
B. geological; biological
C. biological; geographical
D. geological; natural "

Renewable fuels can include fuels that are ______ from renewable energy sources

A. systemized
B. designed
C. symphonized
D. synthesized

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