问题
选择题
在反应物或生成物中肯定没有单质的是（ ）
A．化合反应
B．分解反应
C．置换反应
D．复分解反应
答案
答案：D
A、化合反应，反应物可以是单质。故A不正确；
B、反应，生成物可以是单质。故B不正确；
C、置换反应，反应物和生成物都有单质。 故C不正确；
D、在复分解反应中，反应物和生成物都是两种化合物，没有单质生成
搜题请搜索小程序“爱下问搜题”
在反应物或生成物中肯定没有单质的是（ ）
A．化合反应
B．分解反应
C．置换反应
D．复分解反应
答案：D
A、化合反应，反应物可以是单质。故A不正确；
B、反应，生成物可以是单质。故B不正确；
C、置换反应，反应物和生成物都有单质。 故C不正确；
D、在复分解反应中，反应物和生成物都是两种化合物，没有单质生成
| 阅读理解。 |
| Traveling to every part of the world gets easier, but how well do we know and understand each other. Here's a simple test. Imagine you are planning to hold a meeting at four o'clock. What time should you expect your foreign business friends to arrive? If they are Germans, they'll arrive on time. If they are Americans, they'll probably be 15 minutes early. If they are Englishmen, they'll be 15 minutes late, and you should allow up to an hour for the Italians. The British seemed to think since the English language was widely used in the world, people would always understand what they do. However, they found they were completely wrong. For example, the British are happy to have a business lunch and discuss business matters and have a drink during the meal. The Japanese prefer not to work while eating. Lunch is a time for them to relax and get to know each other and they don't drink at lunchtime. The Germans like to talk business before dinner. The French like to eat first and talk afterwards. They have to be well fed and watered before they discuss anything. |
| 1. What do the Germans prefer when they go to a meeting? |
[ ] |
A. They prefer to be on time. |
| 2. According to the text, if a group of Englishmen, Americans and Italians hold a meeting, who will be the last to arrive? |
[ ] |
| A. The Englishmen. B. The Americans. C. The Italians. D. Both the Englishmen and the Italians. |
| 3. What do the Japanese like to do at lunchtime? |
[ ] |
| A. To drink. B. To get to know each other. C. To talk business. D. To eat only. |
| 4. According to the writer, the British like to _______. |
[ ] |
| A. arrive on time and talk business during the meal B. arrive earliest and hate talking business at a meal C. arrive 15 minutes late and talk business after the meal D. arrive a few minutes late and discuss business during the meal |
| 5. By giving us the two examples, the writer means to show us that _______. |
[ ] |
| A. different countries have different cultures in different parts of the world B. the Germans are more serious and have good living habits C. the Italians are careless people and they are never on time for everything D. the French people are very lazy. They prefer eating and drinking more |