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【单选题】
听力原文：W: Hi, Jack, I just came back yesterday. Anything new while I was away? M: Congratulations, Susan! I hear you will be promoted to manager and become my immediate boss. What's most probably the relationship between the two speakers at the moment?A.
Customer and salesman.
B.
Colleagues.
C.
Employee and boss.
D.
Classmates.
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【单选题】练习题——与年长儿相比，婴幼儿上呼吸道感染的临床特点是
A.
以消化道症状为主
B.
以呼吸道症状为主
C.
以鼻咽部症状为主
D.
以全身症状为重
E.
以神经系统症状为主
【单选题】Which of the following statements on DNA replication is CORRECT ?
A.
DNA is synthesized by extending the 3′ end of the primer, because the 3′-OH acts as a nucleophile during catalysis
B.
DNA Pol use s four different active sites to recognize the four different dNTPs when it catalyzes DNA synthesis
C.
DNA Pol does not add rNTP to the 3′ end of the growing DNA strand because rNTP concentrations are too low in cells
D.
During DNA replication, the leading strand and lagging strand are synthesized toward opposite directions and cannot be coordinated
【简答题】中国FDM技术的开拓者是清华大学的[填空(1)] 。
【多选题】The fidelity of DNA replication is maintained by:
A.
(1) base selection by the polymerase
B.
(2) a 3′→5′ proofreading exonuclease activity that is part of most DNA polymerases
C.
(3) specific repair systems for mismatches left behind after replication
D.
all the above
【简答题】DNA的半保留复制(semiconservative replication)
【简答题】中国FDM技术的开拓者是清华大学的[ ]。A. 颜永年
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