A．holdB．fixC．keepD．retain
A. hold
B. fix
C. keep
D. retain
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How does the Arctic fox survive in winter？
A. It leaves its burrow and migrates to a warmer land.
B. It sleeps soundly inside its burrow in winter.
C. It lives on rabbits or field mice.
D. It stays in its burrow and lives on the food stored there.
According to the last paragraph, which of the following statements about wind farms is true？
A. Onshore wind farms are better than offshore ones.
B. Most residents favour wind farms.
C. Wind farms also have disadvantages.
D. Wind farms may become a spot of natural beauty.
Besides its main mission, the orbiter would also be used as
A. a medical research center.
B. a space station.
C. a space ambulance.
D. a passenger plane.
A．untilB．beforeC．whileD．when
A. until
B. before
C. while
D. when
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