题目

现有下图所示的实验装置，请回答问题： （1）在加入药品之前应对实验装置进行                                       。 （2）可用于实验室制备和收集O2的一套装置是（填字母番号）            。写出用此装置制备O2的反应化学方程式                                             。 （3）若选用A装置制备气体时应考滤的因素是                                  。B( 2015 .河南开封二模) English is spoken as a first language by about 375 million people and as a foreign language by around 750 million people. It is being learned by about a billion people. These numbers alone make English to learn. If you are not fluent (流利的) in English,it may be good for you to know the advantages of learning the language.In many countries?English is used as a working language. In the United States9 English speakers make more money than those who don't speak English at all. Learning English can increase the chance of getting a good job.If you visit a country,you can easily find someone who can speak at least a little English. So if you know English,you have a chance to communicate almost anywhere you travel.It’s not easy for parents who don't understand English to raise children in an English-speaking country. For example ? if they send their children to school and the teacher does not speak their mother language ? parents are likely to have difficulty communicating with the teacher. And if the children have homework they do not understand,parents cannot help them.Want to get advice on how to learn English well? Please go on looking at our website.6. According to the first paragraph,about million people speak English as a first language.A.375   B. 750   C. 1,125   D. 1,5007. Which of the following can be put in the blank in Paragraph 1 ?   A. hopeless   B. difficult   C. boring   D. important8. Which of the following is NOT mentioned in the reading?   A. English is helpful in finding a job.   B. English is helpful in travelling to other places.   C. Children who learn English well can receive more attention.   D. Parents who know English well have little trouble helping kids with homework.9. Who is this passage written for?   A. People who learn English as a first language.   B. People who are not good at English.   C. People who will work in the USA.   D. People who love travelling.10. Where can you probably find the above reading?   A. In a museum. B. In a magazine. C. In a newspaper. D. On the Internet.