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
Laupepa was not satisfied with the United States because it did not ______.
A．agree to sign an agreement to reduce its greenhouse gas emissions
B．sign an agreement with Tuvalu
C．allow Tuvaluans to move to the US
D．believe the problems facing Tuvalu were real
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