列对大肠杆菌DNA聚合酶的叙述，不正确的是（）
A. DNA Pol I可分为大小两个亚基
B. DNA Pol I具有5’→3’的外切酶活性
C. DNA Pol III在复制中链的延长阶段起主要作用
DNA Pol III由四个亚基组成
Which is not the advantages of a corporation（）
A. Easy transfer of ownership
B. Limited life
C. Easy to get financing
D. Entitled to sign contracts
A topic sentence most often appears___（）
A. at the end of a paragraph
B. at the beginning of a paragraph
C. in the middle of a paragraph
D. somewhere near the end
In which of the following sentences the conjunction “while” means “although”（）
A. Strike while the iron is hot
B. While he loves his students, he is very strict with them
C. Please keep an eye on my bicycle while I’m away
D. I like dogs, while my wife hates them
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