抗O试验属于（）
A.直接凝集试验
B.间接凝集试验
C.乳胶凝集试验
D.沉淀试验
E.中和试验
参考答案：E
想一想，选一选。
1. 当妈妈在做晚饭，你想要帮忙时，你应说：[ ]
A. Mom, can I help you?
B. What's for dinner?
2. 当你想说“递给我一本英语书”时，你应说：[ ]
A. Pass me a English book.
B. Pass me an English book.
3. 当你想询问朋友是否想吃些面条时，你应说：[ ]
A. Would you like some noodles?
B. I would like some noodles.
4. 当你想说我会用叉子时，你应说：[ ]
A. I can use the fork.
B. Pass me the chopsticks.
我国主要的经济特区有哪些？
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