单项选择题

It is stated in the passage that before the introduction of television, political parties______.

A．had more influence over the selection of political candidates
B．spent more money to promote their political candidates
C．attracted more members
D．received more money
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单项选择题
It can be inferred from the passage that ______.
A．citizens in the United States are now more informed about political issues because of television coverage
B．citizens in the United States prefer to see politicians on television instead of in person
C．politics in the United States has become substantially more controversial since the introduction of television
D．politics in the United States has been significantly changed by television
单项选择题
According to the passage, DNA fingerprinting can be unreliable when ______.
A．the methods used of blood cell calculation are not accurate
B．two different individuals of the same ethnic group may have the same DNA fingerprinting pattern
C．a match is by chance left with fingerprints that happen to belong to two different individuals
D．two different individuals leave two DNA samples
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