下列实验方案中，能达到实验目的是（ ）
| 选项 | 实验目的 | 实验方案 |
| A | 分离氯化钠和硝酸钾 | 加水溶解、过滤、蒸发 |
| B | 除去CO2中的少量CO | 点燃气体 |
| C | 检验氧气、二氧化碳和空气 | 加入澄清石灰水，观察澄清石灰水的变化 |
| D | 鉴别羊毛和涤纶 | 点燃后看火焰、闻气味、看产物 |
答案：D
题目分析：A、氯化钠和硝酸钾两者均能溶于水，所以经蒸发过滤不能分离两者；B、由于CO2中的少量CO时一氧化碳不易被点燃，所以该方法除掉CO2中的少量CO不可行，一般是采用将混合气体通过灼热氧化铜的方法除掉CO2中的少量CO；C、检验氧气、二氧化碳和空气加澄清石灰水只有二氧化碳能与石灰水反应生成白色沉淀，而空气和氧气加入石灰水不会出现浑浊现象，故该方法不可行；D、羊毛和涤纶点燃时羊毛有焦羽毛味而涤纶有刺激性气味生成，且羊毛燃烧后的固体一捻即碎，涤纶燃烧后的产物较硬不易碾碎，所以该方法可以区分两者；
| 完形填空。 | ||||
| My son Joey was born with club feet. The doctors said that with treatment he would be able to walk, but would never run very well. The first three years of his life was 1 in hospital. By the time he was eight, you wouldn't know he has a problem when you saw him 2 . Children in our neighborhood always ran around 3 their play, and Joey would jump and ran and play, 4 . We never told him that he probably wouldn't be 5 to run like the other children. So he didn't know. In 6 grade he decided to join the school running team. Every day he trained. He ran more than any of the others, 7 only the top seven runners would be chosen to run for the 8 . We didn't tell him he probably would never make the team, so he didn't know. He ran four to five mile every day-even when he had a fever. I was 9 , so I went to 10 him after school. I found him running 11 . I asked him how he felt."Okay," he said. He has two more miles to go. Yet he looked straight ahead and kept 12 . Two weeks later, the names of the team 13 were caked. Joey was number six on the list. Joey had 14 the team. He was in seventh grade - the other six team members were all eighth graders. We never told him he couldn't do it … so he didn't know. He just 15 it. | ||||
|