题目内容

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

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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

Human activities since the beginning of the Industrial Revolution have produced a ______ increase in the atmospheric concentration of carbon dioxide.

A. 40%
B. 50%
C. 10%
D. 30%

Global warming and climate change are terms for the observed century-scale rise in the ______ temperature of the Earth’s climate system and its related effects.

A. highest
B. lowest
C. average
D. common

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