问题
单项选择题
白喉杆菌：（）
A.外毒素
B.内毒素
C.两者均有
D.两者均无
答案
参考答案：A
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白喉杆菌：（）
A.外毒素
B.内毒素
C.两者均有
D.两者均无
参考答案：A
| 补全对话,其中有两项为多余选项. | |
| A: Excuse me,sir. Where is the post office? B: 1 may ask the policeman over there. A: Thank you all the same. (The man goes to the policeman.) A: Excuse me. 2 C: Oh,there isn't a post office near here,but there is one near the supermarket. A: 3 C: It's about two kilometers (千米) away. A: 4 C: You'd better take a taxi. Because it's so late,there aren't any buses now. A: 5 C: You're welcome. | |
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