单项选择题

This clearly shows that crops and weeds have quite a number of ______ in common.

A．tracks
B．traces
C．trails
D．traits
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单项选择题
Ancient Greek gymnastics training programs were considered to be an ______ part of the children’s education.
A．infinite
B．intact
C．inclusive
D．integral
单项选择题
Ever since the first nuclear power stations were built, doubts have ______ about their safety.
A．suspended
B．survived
C．lingered
D．preserved
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