下图是2012年某商品的供给曲线。关于图示中该商品价格由P1点到P2点运行的描述中，下列理解正确的是（ ）
①该商品因供过于求而价值降低②该商品的互补商品需求量增加
③该商品的替代商品需求量增加④该商品因价格上升而扩大生产
A．①②
B．①③
C．②④
D．③④
答案：D
题目分析：价值决定价格，供求影响价格，①说法错误；图中显示，该商品价格由P1点到P2点运行表示价格上涨，人们对其需求量会减少，对该商品的互补品的需求量也会减少，②错误；对该商品的替代品的需求量会增加，③正确；价格上升，生产者获利增加，会扩大生产规模，④正确。该题选D。
| 选词填空。其中有两项是多余的。 | |
It was the early autumn of my 1._____ year at a junior high school, and my old school was far away. As a result, no one knew who I was.I was very 2_____,and afraid to make friends with anyone. Every time I heard the other students talking and laughing, I felt my heart 3._____.I couldn't talk to anyone about my problem, and I didn't want my parents to worry 4._____ me. Then one day, my classmates talked happily with their friends, 5._____ I sat at my desk unhappily as usual. At that moment, a boy entered the classroom. I didn't know who he was. He passed me and then turned 6._____ He looked at me and, without a word, smiled. Suddenly, I felt the touch of something bright and friendly. It made me feel happy, lively and warm. That smile 7._____ my life. I started to talk with the other students and made friends. Day by day, I became more active and closer to everyone in my class. The boy with the lucky 8._____ has become my best friend now. One day,I asked him why he smiled, but he couldn't 9._____ smiling at me! It doesn't matter cven if he didn't tell me the 10._____ ,because all the dark days have gone. Now I believe that the world is what you think it is. If you think you are lonely, you might always be alone. So smile at the world and it will smile back. |