单项选择题

Which of the following is the best title of this passage()

A. Family.
B. American Families.
C. Family Types.
D. Four Family Types in America.

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单项选择题

Amnesty International will go on working until ()

A. many "Prisoners of Conscience" are released from prison
B. its work becomes unnecessary
C. the "Prisoners of Conscience" are redundant
D. all prisoners are released

单项选择题

The main factor in changing the amount of heat on the earth is ()

A. man’s agriculture and industry ways
B. natural weather
C. wind and rain
D. clouds