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【单选题】
端粒酶具有下列哪种酶的活性（ ）A.
RNA聚合酶
B.
反转录酶
C.
DNA水解酶
D.
DNA聚合酶
E.
连接酶
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【单选题】— What's your plan for the summer holiday ? — I'v no idea, but I'v decided at home and have a good rest first. [ ]
A.
stay
B.
to stay
C.
stayed
D.
staying
【简答题】Please illustrate the methods of how to conduct gene therapy using a retroviral vector。
【单选题】New Hopes for Preventing AIDS The success of anti-retroviral(抑止肿瘤病毒) drugs in treating HIV is getting researchers at the 16th International AIDS conference excited at the prospect that the potent(效力大的...
A.
Y
B.
N
C.
NG
【简答题】What kind of v______( 蔬菜 ) do you have for supper?
【单选题】New Hopes for Preventing AIDS The success of anti-retroviral(抑止肿瘤病毒) drugs in treating HIV is getting researchers at the 16th International AIDS conference excited at the prospect that the potent(效力大的...
A.
Y
B.
N
C.
NG
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