单项选择题

Seventy-five percent of the surface of the earth （） by water.

A．are covered
B．is covered
C．have been covered
D．was covered

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单项选择题
How many kilometers did Hubert Latham’ airplane flies
A．Twenty.
B．One hundred.
C．Ten.
D．One thousand~
单项选择题
Why did the customs officer rush to the plane
A．To see if the plane was broken.
B．To make sure that the pilot was not hurt.
C．To ask why the plane had landed in a farmer’s field.
D．None of the above.
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