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【单选题】
关于RNA聚合酶和DNA聚合酶的叙述哪一项是正确的?A.
利用核苷二磷酸合成多核苷酸链
B.
RNA聚合酶需要引物，并在其5末端添加碱基
C.
DNA聚合酶能同时在链两端加入核苷酸
D.
DNA聚合酶只能以RNA为模板合成DNA
E.
RNA聚合酶和DNA聚合酶只能在核苷酸链3—OH末端加入单核苷酸
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【单选题】The term flood current refers to that time when the water ().
A.
is flowing towards the land
B.
is moving towards the ocean
C.
level is not changing
D.
level is rising because of heavy rains
【单选题】To prevent flooding in winter the water flowing from the dam is constantly ____ by a computer.
A.
managed
B.
monitored
C.
graded
D.
conducted
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