题目

某无色溶滚中可能含有Na+、NH4+、Ba2+、Cu2+、SO42﹣、SO32﹣、Cl﹣、Br﹣、CO32﹣中的若干种.为检验其中含有的离子,进行如下实验: ①取10mL溶液,加入足量氯水,.无气体产生,再加入CCl4溶液分层,下层为橙红色; ②分液后,将①中上层溶液加入足量BaCl2和HCl溶液,产生白色沉淀2.33g; ③另取10mL原溶液,加入过量的浓氢氧化钠溶液并加热,收集到标准状况下448ml气体.下列关于原溶液的说法正确的是 A.肯定存在NH4+、Cl﹣、Br﹣ B.SO42﹣、SO32﹣至少含Monday is the first work day for most(大多数)Americans and also the first day of the week.   It is eight o'clock on a Monday morning, and it is ___1_____ A cold wind is ___2_____ and the sky(天空) is grey(灰色的). Men and women are going ___3_____ work. Some are walking. Some are riding on bikes. Some are waiting for buses on windy corners(角落)in the rain. ____4____ are driving their cars, or riding ____5____ the cars of their neighbours(邻居)and friends. The city streets are ____6____ of cars and buses. All are moving slowly, one after another(一个接一个), ___7_____ the city streets and on the roads between cities and towns.   Children are going to ___8_____ . Some are riding on school buses. Some are riding in ____9____ parents cars. Many are walking, and they are ____10____ very happy. Life is not beautiful on a rainy Monday morning. ( )1. A. fine       B. sunny            C. raining           D. snowing ( )2. A. going     B. blowing            C. welcome          D. reading ( )3. A. to        B. at                C. in                D. before ( )4. A. Another    B. Other             C. Others           D. Rest ( )5. A. in        B. by               C. to                D. with ( )6. A. little       B. few             C. empty            D. full ( )7. A. to        B. along             C. up               D. out ( )8. A. play       B. work             C. town             D. school ( )9. A. the        B. their             C. our              D. his ( )10. A. all        B. always           C. never             D. not  
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