单项选择题

Questions 4 to 6 are based on the following conversation.
The geologists’ research indicates that

A. comets contain no water.
B. comets contain little water.
C. comets water can’t form rain.
D. comets water can’t form enough rain.
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单项选择题
Steve wants to travel, to London by train instead of bus because
A. the bus is more expensive.
B. the train is more comfortable.
C. he can get cheap train tickets.
D. he hates to travel by bus.
单项选择题
What did space satellites capture recently
A. The formation of ocean water.
B. Comets colliding with the earth’s atmosphere.
C. Comets collisions and cosmic dust.
D. Comets falling into the ocean water.
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