单项选择题

What might be the most suitable title for the text

A．Two Important Tests on Airplanes.
B．The Importance of Flying Safely.
C．The Danger of Testing Airplanes.
D．How Airplanes Are Made and Tested.
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单项选择题
The text is mainly about ______.
A．rapid changes in earth's temperature
B．bad effects of global warming
C．moving of a country to a new place
D．reasons for lowland flooding
单项选择题
According to scientists, the DIRECT cause of more and fiercer storms is ______.
A．greenhouse gas emissions in industrialized nations
B．higher surface water temperatures of the sea
C．continuous global warming
D．rising sea levels
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