单项选择题

According to the text, why are test flights most dangerous

A．The plane may explode in the air.
B．The pilot may lose control of the plane.
C．The engines may be damaged.
D．Too much air may get into the plane.
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According to scientists, the DIRECT cause of more and fiercer storms is ______.
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B．higher surface water temperatures of the sea
C．continuous global warming
D．rising sea levels
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The country whose situation is similar to [hat of Tuvalu is ______.
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B．New Zealand
C．the Maldives
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