单项选择题

The U.S. is known as a great "melting pot” because______.

A. the weather in most part of land is hot
B. the land has several famous volcanoes
C. its people are of different nationalities from all over the world
D. its people are very friendly
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单项选择题
In the idiom in good feather , we change good into high, full without changing meaning. This change of constituent is known as______.
A. addition
B. replacement
C. position-shifting
D. variation
单项选择题
According to the conversation when are all the big shops closed
A．On weekend.
B．On Sunday.
C．On workday.
D．On Saturday.
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