问题
选择题
某溶液中含有NH4＋、SO32－、SiO32－、Br－、CO32－、Na＋，向该溶液中通入过量的Cl2，下列判断正确的是[ ]
①反应前后，溶液中离子浓度基本保持不变的有NH4＋、Na＋
②有胶状物质生成
③有气体产生
④溶液颜色发生变化
⑤共发生了2个氧化还原反应
A．①②③④
B．②③④
C．①③⑤
D．②④⑤
答案
答案：A
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某溶液中含有NH4＋、SO32－、SiO32－、Br－、CO32－、Na＋，向该溶液中通入过量的Cl2，下列判断正确的是[ ]
①反应前后，溶液中离子浓度基本保持不变的有NH4＋、Na＋
②有胶状物质生成
③有气体产生
④溶液颜色发生变化
⑤共发生了2个氧化还原反应
A．①②③④
B．②③④
C．①③⑤
D．②④⑤
答案：A
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| I've got some information for everyone going to America next month. As you know, you'll be staying with a family for two weeks. Now the most important thing is money. You should take about ￡30 in cash (现金) and about ￡200 in travelers cheques (支票). Then when you arrive at the airport you'll be met by our host (主人) family. You must remember to wear a red shirt so the family will find you easily. I've told them to look out for the red shirts. You'll also need to take with you 4 photos of yourself and, of course, it's very important that you take the school letter. While you are there, if you have any problems, you can call our agent (代理人). I'll give you her office phone number now: It's 580-4436 and the person to ask for is Mrs. Belcher, that's B-E-L-C-H-E- R. She's in the office from 9-5 every day. OK! That's everything. Have a good trip. 根据短文内容填写下表，每空词数不限：
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