（4分）如图是某趣味实验装置图，挤压胶头滴管后，可观察到什么现象？请分析其原因，并写出化学方程式。
（共4分）气球胀大（1分）；CO2被浓NaOH溶液吸收，锥形瓶内的气压减小，外界大气压大于锥形瓶内的气压，使气球胀大（2分）。2NaOH + CO2 ="=" Na2CO3 + H2O（1分）
此题考查氢氧化钠溶液与二氧化碳的反应。由于二氧化碳与氢氧化钠溶液能反应，使瓶内气体减少，压强变小，故气球胀大。
| 阅读下面短文，从短文后所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 | ||||
| We got over 1000 letters, faxes and e-mails from our readers 1 their New Year's resolutions. Many readers are going to work 2 in school this year than before. Lots of readers are going to play sports. Some readers want to be healthier. So they are going to eat more 3 . A few readers are going to learn a new language. 4 girls are going to exercise more to keep fit. Some parents are going to study the subjects 5 children learn at school. They want to 6 better with their kids. One old lady is going to 7 her job and she wants to find a job 8 a language teacher in China. What do young people 9 about places in town? We also did a survey of our readers and this is what we 10 . All the movie theaters are good, but the Screen City is the best in our town. It 11 the biggest screens and the most comfortable seats. 12 , Town Cinema is the cheapest, and it has the friendliest service. The most popular clothing store is Jason's. It has the best quality clothing. It's also the cheapest. Funky Fashions is the 13 . It has really bad service. 14 radio stations, most people think that Jazz 107.9 FM is really great. It 15 the most interesting music. | ||||
|