单项选择题
Which of the following U.S. presidents is involved in the Watergate scandal
A. Carter.
B. Nixon.
C. Reagan.
D. Clinton.
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单项选择题
The process of dividing members of the population into homogeneous subgroups before sampling is______.
A. random sampling
B. stratified sampling
C. systematic sampling
D. simple sampling
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单项选择题
Which is the largest in size among the four countries below
A. America.
B. Australia.
C. Canada.
D. China.
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