单项选择题

Questions 4 to 6 are based on the following conversation.
Geologists believe that ocean water came from

A. comets.

B. raindrops.
C. volcanoes.

D. other planets.
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单项选择题
Where are the photos much cheaper
A. In a photographer’s studio.
B. In the library.
C. In the post office.
D. Not mentioned.
单项选择题
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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