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问题
单项选择题 B型题
能导致Vero细胞病变的物质是（）
A.定植因子
B.肠毒素
C.志贺样毒素
D.脂多糖
E.K抗原
答案
参考答案：
C
选择题
When I got to his house, his father came out and said, "_______".
A. You are welcome.
B. Oh, you've come.
C. It's kind of you to come.
D. Why, you didn't come until now.
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单项选择题
按时向公司档案室移交目录一式（）份。
A.1
B.2
C.3
D.4
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