大肠杆菌DNA聚合酶I型5’→3’外切核酸酶活性的反应底物是（）

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问题单项选择题

A.单链DNA及引物

B.5’突出的双链DNA

C.双链DNA或DNA：RNA杂交体

D.带3’—OH的双链DNA或单链DNA

答案

参考答案：C

完形填空

动词填空用括号内所给动词的适当形式填空。（本大题共8分，每小题1分）

小题1:They _________ a series of pre-recorded tapes to the language laboratory in the past 2 days. (send)

小题2:Remember that teaching others is ________ yourself. (teach)

小题3:The old man _________ to go to college, but didn’t. (hope)

小题4:He was very sure that sooner or later he ________ passing the driving test. (succeed)

小题5:Hurry up! The boss needs the work ________ tomorrow! (do)

小题6: ---Why not look at page 20 of your English book?

---Ah, here the key is! I wonder why I _______ of this. (not think)

小题7:There’s no one in the lab. Everybody has been seen ________ out. (go)

小题8:He who does not reach the Great Wall ________ a true man. (not be)

多项选择题

过敏性紫癜常见的临床表现包括（）

A.皮肤紫癜

B.腹痛及消化道出血

C.关节肿痛

D.尿蛋白（+）

E.ANA（+）