对某已经达到化学平衡状态的可逆反应，如果改变某种条件，使某反应物的浓度减小，则下列说法不正确的是
A．平衡可能向正反应方向移动
B．平衡可能向逆反应方向移动
C．生成物的浓度相应增大
D．平衡可能移动也可能不移动
答案：C
题目分析：对于达到平衡状态的可逆反应，反应物浓度减小，平衡可能向左移动，如2SO2(g)+O2(g) 
2SO3(g)反应达到平衡后减小二氧化硫浓度；平衡也可能不移动，如2HI(g) H2(g)+I2(g)达到平衡时，扩大容器体积，平衡不移动；平衡也可能向右移动，如正反应为吸热反应的可逆反应，升高温度，平衡向右移动，反应物浓度减小。A、B、D正确。
点评：化学平衡向右移动说明正反应速率大于逆反应速率、生成物产率增加。反应物浓度减小，平衡可能移动也可能不移动。
| 阅读理解。 |
| It was a beautiful sunny day. Miguel decided to go to the beach. He called his friends, but Mario was at work, and Rosa was at her grandmother's home. So he had to go to the beach alone. He took his bathing suit, towel, beach umbrella and his new boombox. When he arrived at the beach, there weren't many people. There was a family with two little children. There were some American tourists at the shop. Miguel put up his beach umbrella and lay down. He turned on his radio and began to enjoy the beautiful music. Soon Miguel went to sleep. While he was asleep, a man came and sat near him. He had a small radio and it played same music as Miguel's. After a few minutes, the man picked up Miguel's boombox and walked away. When Miguel woke up, his radio was gone, and the thief's little old radio was in its place. |
| 1. What is a boombox according to the passage? |
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| A. A TV set. B. A radio. C. An umbrella. D. A bed. |
| 2. Who went to the beach with Miguel? |
[ ] |
| A. Mario. B. Rosa. C. His grandma. D. Nobody. |
| 3. Put the following in the right order (次序) that happened. ① Miguel fell asleep. ② Miguel lay down on the beach. ③ Miguel called his friends. ④ Miguel got to the beach |
[ ] |
| A. ①②③④ B. ③④②① C. ②③①④ D. ②③④① |
| 4. Miguel was a ______ boy. |
[ ] |
| A. good B. rich C. careless D. poor |
| 5. What can we learn from the passage? |
[ ] |
| A. We should look after our things well when we are out. B. We should not take our radios out. C. We should not sleep on the beach. D. We should not sleep alone. |