单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．The stories probably weren’t true.
B．Tom doesn’t usually tell funny stories.
C．She’s surprised Tom was so serious last night.
D．She wants to know where Tom heard the stories.
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单项选择题
The word relegate (Line 5, Para. 3) most probably means ______ .
A．delegate
B．invigorate
C．reduce
D．undermine
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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