可逆反应：A(s)+B(g)
nC(g) △H=Q在不同条件下反应混合物中C的百分含量和反应时间的关系曲线，如图所示。下列有关叙述中一定正确的是
A．若条件为催化剂，则a表示有催化剂， b表示没有催化剂
B．若只控制温度，则a比b的温度高，Q>0
C．若只控制压强，则a比b的压强大，n≥2
D．由图象可以作出判断，反应从逆反应方向开始
答案：C
| 阅读理解。 |
| One day, a little monkey and a little fox went out to play. They saw an apple tree on the other side of the river. There were many big and red apples on it. But there was no bridge over the river. The monkey thought hard and had an idea. They pulled down a tree and put it over the river as a bridge. The monkey said, "My old friend, you go there first." But after the fox went to the other side, he kicked (踢) the tree into the river and ran to the apple tree. "How can I get there without the tree?" cried the monkey. The fox laughed and said, "You just stand there and watch me eating the apples." The monkey was very angry. Suddenly it began to rain. The water level (水位) in the river rose (上涨) and tree flew away with the water. "You can eat all the apples. But you can't come back," shouted the monkey. The fox stopped eating and looked at the monkey sadly. |
| 1. The little monkey and the little fox wanted to _____ on the other side of the river. |
[ ] |
| A. build a bridge B. eat the apples C. pull down a tree D. play games |
| 2. The fox kicked the tree into the river because he wanted to _____. |
[ ] |
| A. eat all the apples by himself B. share the apples with the monkey C. get the apples first D. play a joke on the monkey |
| 3. The fox could not come back because _____. |
[ ] |
| A. the monkey had taken away the tree B. the tree had flown away C. it began to rain D. he was angry with the monkey |
| 4. The fox was sad because ______. |
[ ] |
| A. the monkey was laughing B. he couldn't reach the apples C. he couldn't come back D. the monkey went home first |
| 5. The story tells us that _____. |
[ ] |
| A. the fox shouldn't go first B. the monkey should go first C. the fox was cleverer than the monkey D. one shouldn't care only about himself |