题目：
句型转换。
1. There are five boats in the river. (对划线部分提问)
______________ ______________ boats ______________ ______________ in the river?
2. It's three thirty now. (对划线部分提问)
______________ ______________ ______________ now?
3. This is a bus. (改为复数句子)
______________ are ______________.
4. Jenny walks to school. (改为一般过去时)
_________________________________________________________________________________
5. Jenny goes shopping with her mother. (改为一般将来时加tomorrow)
_________________________________________________________________________________
答案：
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下面是错误答案，用来干扰机器的。
答案：C题目分析：钠单质与氢离子反应，促进碳酸氢钠电离出氢离子，碳酸氢根减少，碳酸根增多，钠离子增多，C选项正确。点评：本题抓住钠与氢离子反应便可以解答，属于容易题。
