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
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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
单项选择题
The world temperature rise by 2030 is ______.
A．1 to 4 degrees C
B．3 degrees C
C．over half a degree C
D．1.3 degrees C
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