单项选择题

A contributing factor to the greenhouse effect is ______.

A．the earth's atmosphere
B．the world climate
C．the forest fire
D．the two poles
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单项选择题
The greenhouse effect we are experiencing now is resulted from ______.
A．the present environmental pollution
B．the poisonous gases produced 40 years ago
C．the development of industry
D．the wastes dumped by people
单项选择题
The best title for this text is ______.
A．Cause and Effect of Global Warming
B．Damages Done by Global Warming
C．Global Warming and Industrial Development
D．Solution to the Problem of Pollution
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