问题
选择题
下列情况中，比热容会发生变化的是（ ）
A．水温从80℃上升到90℃
B．把铁圆柱体拉成细铁丝
C．砖块的体积减少一半
D．水结成冰
答案
当物质的状态发生变化时，物质的比热容会发生变化．故选D．
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下列情况中，比热容会发生变化的是（ ）
A．水温从80℃上升到90℃
B．把铁圆柱体拉成细铁丝
C．砖块的体积减少一半
D．水结成冰
当物质的状态发生变化时，物质的比热容会发生变化．故选D．
| 完型填空。 | |||
| That day was like any other day in his life. After school Michael walked past the shop in the street corner. He stopped to 1 the front row of shoes, and he felt sorry for himself. He 2 wanted to have a pair for his birthday. He walked away sadly and thought of what to tell his mother. He knew she would give him 3 if she could. But he also knew very well she had 4 money. He decided not to go home 5 as he looked worried and his mother would notice it. So he went to the park and sat down on the grass. Then he saw a boy in a wheel chair. He noticed that the boy moved the wheels with his hands. Michael looked at him carefully and was 6 to see that the boy had no feet. He looked 7 at his own feet. "It is 8 better to be without shoes than 9 feet." he thought. There was no reason for him to 10 so sorry and sad. He went away and smiled, thinking he was more lucky in his life. | |||
| ( )1. A. see ( )2. A. gladly ( )3. A. something ( )4. A. little ( )5. A. at once ( )6. A. pleased ( )7. A. up ( )8. A. much ( )9. A. out of ( )10. A. look | B. look at B. nearly B. what B. a little B. then B. excited B. through B. quite B. with B. feel | C. hear C. really C. nothing C. much C. just now C. surprised C. out C. very C. without C. appear | D. notice D. quickly D. anything D. lots of D. at all D. interested D. down D. less D. having no D. seem |