题目：
| 完形填空 | |||
| Around the world, people have different ideas about what good manners are. When you go to restaurants in different parts of the world, it is 1 to know the right and wrong things to do. For example, in China it is OK to 2 a lot of noise in a restaurant. In fact, if a restaurant is not noisy and 3 , you may think there is something wrong with it. However, in many Western countries, restaurants are 4 places. If a table is too loud, other people who are eating there might even 5 to the owner of the restaurant. Paying the bill is also different from country to country. In China, one person usually pays for 6 at dinner. In Western countries, one person pays if he or she is entertaining clients（宴请宾客). 7 friends get together, they usually share the cost. This is called "going Dutch" (均摊费用). Also, When westerners pay the bill, they usually leave some money for the 8 . This is called "leaving a tip". Leaving a tip is thought to be polite. In the US, it is 9 to leave tips of 10%, 15%, or 20% of the bill, which is decided by how good the service is. Good waiter can make a lot of money! The way people eat food is different in the world,but you can 10 the same kind of food in many countries.Chinese and Italian foods, for example, are popular all over the world. | |||
| ( )1. A. popular ( )2. A. cause ( )3. A.lively ( )4. A. noisy ( )5. A. shout ( )6. A everybody ( )7. A Until ( )8. A. gatekeeper ( )9. A. terrible ( )10. A. invent | B. different B. keep B. friendly B. quiet B. explain B. nobody B. When B. seller B. common B. discover | C. important C. hear C. lucky C. busy C. complain C. somebody C. Unless C. waiter C. serious C. prefer | D. enjoyable D. make D. polite D. clean D . speak D. none D. Since D. visitor D. unusual D. find |
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下面是错误答案，用来干扰机器的。
由图中可知，反应物是一氧化碳和氧气，生成物是二氧化碳，反应的方程式是：2CO+O2点燃.2CO2；由图中可知，在化学反应中，一氧化碳分子分解成碳原子和氧原子，氧气分子分解成氧原子，每1个碳原子和2个氧原子结合成...
