问题
选择题
在t℃时，将0.2 mol X和0.8 mol Y充入体积恒定的密闭容器中，当反应X(g)＋Y(g) 
nZ(g)＋R(g)达到平衡时，若将反应混合气体中各物质浓度均增大一倍，X的转化率不变，已知t℃时该反应的K=1，则X的转化率为
A．80％
B．65％
C．45％
D．37％
答案
答案：A
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在t℃时，将0.2 mol X和0.8 mol Y充入体积恒定的密闭容器中，当反应X(g)＋Y(g) nZ(g)＋R(g)达到平衡时，若将反应混合气体中各物质浓度均增大一倍，X的转化率不变，已知t℃时该反应的K=1，则X的转化率为
A．80％
B．65％
C．45％
D．37％
答案：A
| 阅读理解。 |
| Mr and Mrs Smith had always spent their summer holidays in New Jersey (新泽西) in the past, staying in a small inn (旅店) at the foot of a hill. One year, however, Mr Smith made a lot of money in his business, so they decided to go to London and stay at a really good hotel while they went touring around that famous city. They flew to London and arrived at their hotel late one evening. They had expected that they would have to go to bed hungry, because in that small inn in New Jersey, no meals were served after seven. They were surprised when the waiter asked whether they would take dinner there that night. "Are you still serving dinner?" asked Mr Smith. "Yes, certainly, sir," answered the waiter. "We serve it until half past nine." "What are the times of meals then?" asked Mr Smith. "Well, sir," answered the waiter. "We serve breakfast from seven to half past eleven in the morning, lunch from twelve to three in the afternoon, tea from four to five, and dinner from six to half past nine." "But that hardly leaves any time for us to see the sights of London." said Mr Smith. |
| 1. Mr and Mrs Smith had always spent their holidays in ______. |
[ ] |
| A. New York B. London C. New Jersey D. Washington |
| 2. When Mr and Mrs Smith had a lot of money, they decided to go to ______. |
[ ] |
| A. their hometown B. the capital of England C. New Jersey D. a small city in England |
| 3. They went to London by ______. |
[ ] |
| A. sea B. plane C. train D. bus |
| 4. From the story we know that this was the ______ time for Mr and Mrs Smith to go to London. |
[ ] |
| A. first B. second C. third D. fourth |
| 5. What does the sentence "But that hardly leaves any time for us to see the sights of London" mean? |
[ ] |
| A. We can go to see the sights of London at any time. B. We have enough time to see the sights of London. C. We can see more sights of London. D. We have little time to see the sights of London. |