除去下列物质中所含的杂质，选用的试剂正确的是（ ）
| 选项 | 物质（杂质） | 试剂 |
| A | Al2O3（SiO2） | NaOH |
| B | CO2（SO2） | Na2CO3溶液 |
| C | FeCl2溶液（FeCl3） | Fe粉 |
| D | NaHCO3溶液（Na2CO3） | Ca（OH）2溶液 |
A．A
B．B
C．C
D．D
A．因氧化铝与二氧化硅均与NaOH溶液反应，不能利用选择NaOH溶液来除杂，可选HF酸溶解后过滤，故A错误；
B．二氧化碳与二氧化硫均与Na2CO3溶液反应，则不能除杂，可选饱和NaHCO3溶液利用洗气法除杂，故B错误；
C．Fe不与FeCl2溶液反应，与FeCl3溶液反应生成FeCl2，除去杂质且不引入新的杂质，故C正确；
D．NaHCO3与Na2CO3均与Ca（OH）2溶液反应，则不能除杂，可通入足量的二氧化碳来除杂，故D错误；
故选C．
第Ⅱ卷非选择题（二部分，共35分） 第四部分：任务型阅读（共10小题，每小题1分，满分10分） 请认真阅读下列短文，并根据所读内容在文后表格中的空格里填入一个最恰当的词。 注意：每空只填1个单词。请将答案写在答题卡上相应题号的横线上。 Five tips to deal with stress Stress, the biggest enemy of the modern world! It kidnaps our peace of mind, tortures our evenings, when we return home from work and murders those beautiful moments. But like all enemies, this enemy can also be got rid of! Put your body in motion. Moving from the chair to the couch while watching TV is not being physically active! Physical activity is one of the most important ways to keep stress away by clearing your head and lifting your spirits. Physical activity also increases endorphin levels—the natural “feel-good” chemicals. Laugh Some say that laughter is the best medicine—well, in many cases, it is! Did you know that it takes 15 facial muscles to laugh? Lots of laughing can make you feel good—and, that good feeling can stay with you even after the laughter stops. So , head off stress with regular doses of laughter by watching a funny movie or cartoons, reading a joke book, or even make up your own riddles…laughter can make you feel like a new person! Everyone has those days when they do something really silly or stupid. Instead of getting upset with yourself, laugh out loud! No one’s perfect! Life should be about having fun. So , lighten up! Have fun with friends. Being with people you like is always a good way to get rid your stress. Get a group together to go to the movies, shoot some hoops, or play a board game—or just hang out and talk. Friends can help you work through your problems and let you see the brighter side of things. Spill （发泄）to someone you trust. Instead of keeping your feelings bottled up inside, talk to someone you trust or respect about what’s Bothering you. It could be a friend , a parent, someone in your family, or a teacher. Talking out your problems and seeing them a different view might help you figure out ways to deal with them. Just remember, you don’t have to go it alone! Lend a hand. Get involve in an activity that helps others. It’s almost impossible to feel stressed out when you’re helping someone else. It’s also a great way to find out about yourself and the special qualities you never knew you had! Signing up for a service project is a good idea, but helping others is as easy as saying hello, holding a door, or volunteering to keep a neighbor’s pet. The feeling you will get from helping others is greater than you can imagine! Remember , you’re not alone—everyone has stresses in their lives…it’s up to you to choose how to deal with them. Five tips to deal with stress
|