单项选择题

The warming weather of the past hundred years may()

A. begin
B. end
C. be another ice age
D. start

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单项选择题

In how many fields are prizes bestowed()

A. 2.
B. 5.
C. 6.
D. 10.

单项选择题

Which is the best title of this passage()

A. The Earliest People in North America.
B. The Earliest Immigrants to North America.
C. The PeOple of the United States.
D. Europeans Were the Earliest People Coming to the North America.