题目

下列反应中，改变反应物用量或浓度不会改变反应产物的是（    ） A．H2S在氧气中燃烧                                      B．铁在硫蒸气中燃烧 C．SO2通入石灰水                                         D．H2SO4中加入锌粉 答案：B选择合适的句子完成对话。A. Were there many people in the parade?B. Where did you go last Sunday?C. Some played the trumpet.D. Of course I did.E. What did you see there?A: Hello, Xiaoming.【1】B: I went to Hong Kong and visited Disneyland with my family.A:【2】B: At 3:00 in the afternoon, I saw the great parade.A: Wow, cool.【3】B: Yes, there were so many people!A: What did they do in the parade?B: Some played the drum.【4】Some sang and danced.A: Did you have a good time there?B:【5】