单项选择题

The concept of universal elementary education, regardless of sex, had been born, but it was still in the ________ of the single-sex school.

A．realm
B．terrain
C．plateau
D．latitude
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单项选择题
In spite of the ________ fate of the nuclear power cooperation agreement, the visit on the whole appeared to have been a success.
A．ambitious
B．vigorous
C．prosperous
D．ambiguous
单项选择题
DNA fingerprinting can be unreliable when ________.
A．the methods used for 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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