简述毒性噬菌体和温和性噬菌体之间的异同。
参考答案：
毒性噬菌体是指侵入宿主细胞后进行复制增殖，导致宿主细胞裂解的噬菌体。温和噬菌体是指侵入宿主细胞后随宿主细胞的生长繁殖而传代下去，一般不引起宿主细胞裂解的噬菌体。它们之间最本质的区别是毒性噬菌体引起宿主细胞裂解，而温和噬菌体一般不引起宿主细胞裂解。温和噬菌体既可在受到理化因子的刺激诱发成为毒性噬菌体，也可以自行消失，使宿主细胞成为非溶源性细胞，还可以使宿主细胞具有免疫性。
| 完形填空。 Hector is always busy at work. But next month he is l a long vacation. He is going to China 2 his sister. They are going to the Great Wall and the Palace Museum. They are staying there for 3 two weeks. They have some Chinese friends there, 4 they are also visiting them. Then they're going to Hangzhou to have a 5 the West Lake. They're going sightseeing and 6 the beautiful gardens there. They are planning to stay for a week. 7 they are going to Mount Tai in Shandong. They are going hiking in the 8 . Five or six days later they'll 9 to New York. Then they will l0 go on with the busy work. | ||||
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