在实验室中为了鉴别氢氧化钠溶液和醋酸溶液，同学们提出了下列几

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问题选择题

在实验室中为了鉴别氢氧化钠溶液和醋酸溶液，同学们提出了下列几种方法：①分别滴加紫色石蕊溶液；②分别滴加酚酞溶液；③闻气味；⑧品尝；⑤分别加入一小段镁带；⑥分别加入大理石。其中可行的是[ ]

A．都可以

B．①②③④

C．①②③⑤⑥

D．①③④⑤⑥

答案

答案：C

改错题

One day, while my friend and I was traveling through 76__________

Germany, we were not very hungry but we only had a little 77__________

money. We decided stop at a village market to buy 78__________

something to eat. We choose the cheapest biscuits and 79.__________

ate it under a tree. We thought the biscuits were great. 80__________

“Let’s got some more,” I said, “They’re cheap and they 81__________”

really taste well.” My friend could read some German, but 82__________

I couldn’t, and I gave her the biscuit bag to find the name. 83._________

She looked at it and started to laugh, “How are you laughing?” 84._________

I asked. “Because they’re dog biscuits!” She said. 85._________

单项选择题

1765－1870年的工人运动，其主要作用在于（）

A.促进国际工人运动走向联合

B.推动各 * * 党的建立

C.推动了政治民主化进程

D．实践了马克思主义理论