问题
判断题
硅酸盐可以以硅酸氢根离子的状态存在于天然水中，也可以以胶体或悬浮物状态出现。（）
答案
参考答案：对
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硅酸盐可以以硅酸氢根离子的状态存在于天然水中，也可以以胶体或悬浮物状态出现。（）
参考答案：对
| 从方框中选择恰当的句子完成对话。 | |
B: I've got a sore throat and a headache. A: Do you feel tired ? B: Yes, my whole body feels weak. 2 A: I'm sorry to hear that. I'll have to examine you. Open your mouth wide so that I can look at your throat. Yes. It's very red, I'll have to give you an injection. B: 3 A: An injection is better than pills. B: Are you sure? 4 A: But you'd better have an injection first. It is more helpful. B: OK. 5 A: Probably, if you take a rest today. B: Good. |