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【多选题】
参与大肠杆菌 DNA 复制的 DNA 聚合酶有A.
DNA 聚合酶 Ⅰ
B.
DNA 聚合酶 Ⅱ
C.
DNA 聚合酶 Ⅲ
D.
DNA 聚合酶 Ⅴ
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举一反三
【单选题】听力原文： St. Valentine's Day has roots in several different legends that have found their way to us through the ages. One of the earliest popular symbols of the day is Cupid, the Roman god of love, who i...
A.
3.
B.
4.
C.
5
D.
6
【单选题】Pressed from his parents, and ________ that he has wasted too much time, the boy is determined to stop playing video games. [ ]
A.
realizing
B.
realized
C.
to realize
D.
being realized
【简答题】任务型阅读：根据短文内容，填写下列各题。 John is an American boy. His family is in China now. John likes chocolates(巧克力) very much. But his mother doesn’t give him any. They are not good for him, she thinks. But John has...
【简答题】阅读理解。 In the small town of St. Petersburg during the mid to late 1800's, lived a boy named Tom Sawyer. He is a clever and naughty boy who doesn't have many friends. Will Tom make good choices and find...
【简答题】根据短文内容，判断正(T)误(F)。 Xiao Ming is a middle school student. He is a good boy, and he studies very hard. But his family is very poor, because his mother got ill a few years ago, and his father has no job....
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