单项选择题

What is the main topic of the passage().

A.The mechanics of rain.
B.The climate of North America.
C.How gravity affects air current.
D.Types of clouds.

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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
They are mainly talking about ().

A. a new house
B. an old house
C. a new bedroom
D. a new neighborhood
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