When I was at college I _____three foreign languages, but I_____ all except for a few words of each.
A. spoke; had forgotten
B. spoke; have forgotten
C. had spoken; had forgotten
D. had spoken; have forgotten
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The police found that the house _____and a lot of things____.
A. has broken into; has been stolen
B. had broken into; had been stolen
C. has been broken into; stolen
D. had been broken into; stolen
外毒素的特性不包括（ ）
A. 化学本质是蛋白质
B. 毒性强
C. 对组织器官无选择性
D. 不耐热
E. 可用甲醛脱毒而制成类毒素
与细菌致病性无关的是（ ）
A. 荚膜
B. 内毒素
C. 侵袭性酶类
D. 菌毛
E. 类毒素
病原菌一时或间断性地入血，但在血中不繁殖的是（ ）
A. 毒血症
B. 败血症
C. 内毒素血症
D. 菌血症
E. 脓毒血症
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