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【单选题】
进入二三双联暗装插座的管内穿线有（）根线。A.
2
B.
3
C.
4
D.
5
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举一反三
【单选题】It is hoped that an end can _______ to pollution of any kind and we humans can live ______ with nature.
A.
be put; in harmony
B.
be adjusted; in terms with
C.
be adopted; in condition
D.
resigned; in agreement
【单选题】In what ways can animals help humans, according to the lecturer?
A.
Animals can communicate with humans.
B.
They can carry heavy loads long distances.
C.
They know how to plant food crops and can teach humans how to do it.
D.
They can harvest food crops without human involvement.
【单选题】The passage indicates that
A.
humans can never regenerate limbs．
B.
humans might be able to regenerate limbsin the future．
C.
human limbs may be regenerated on someanimals first．
D.
regeneration of human limbs will SOON become a reality．
【单选题】How has the knowledge of echolocation been used by humans?
A.
Humans can now talk to dolphins.
B.
It is the basis of sonar technology.
C.
The fishing industry can avoid dolphins.
D.
Blind people use echolocation to navigat
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