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
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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