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【单选题】
DNA 复制的精确性远高于 RNA 的合成,这是因为:A.
新合成的 DNA 链与模板链之间形成双螺旋结构，而 RNA 链则不能
B.
DNA 聚合酶有 3’→5’ 外切酶的活性，而 RNA 聚合酶无相应的活性
C.
脱氧核苷酸之间氢键配对的精确性高于脱氧核苷酸与核苷酸之间配对的精确性
D.
DNA 聚合酶有 5’-3’ 外切酶的活性，而 RNA 聚合酶无此活性
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【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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