问题
选择题
| 下列关于功率和机械效率的说法中，正确的是（ ） A．功率大的机械，做功一定多 B．做功多的机械，效率一定高 C．做功快的机械，功率一定大 D．效率高的机械，功率一定大 |
答案
答案：C
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| 下列关于功率和机械效率的说法中，正确的是（ ） A．功率大的机械，做功一定多 B．做功多的机械，效率一定高 C．做功快的机械，功率一定大 D．效率高的机械，功率一定大 |
答案：C
| 完形填空。 | ||||
| Hearing the front door open, I ran down to the kitchen and waited. I saw my dad come in, with the white envelope in his hand. I had waited all day for this, so I reached over him for it as soon as he set foot into the house. Angrily, he 1 the envelope on the table and said that it was nothing to get excited about, and that it was just a piece of paper. I grabbed (抓取) it and ran upstairs. I wondered why my dad did not understand how 2 I was to see my mid-year report card for my first year in middle school. I was really 3 by how he refused to consider all my hard work. I saw my class rank (等级): 1/139. I did not behave what I saw. I felt my lips (嘴唇) form a smile and wanted to run downstairs to tell everyone. Then I 4 what my dad had said-it was nothing to get excited about. I wanted to share my happiness with someone, but felt lonely. I realized that I had become distant (远隔的) from my family. We used to 5 late watching Disney movies, and my brothers, sisters and I would play tennis in the backyard all the time. I wondered when all that had 6 . I just no longer took part in them. My school work 7 all my time and energy. While I had been busy with my study, I had also built a 8 between me and my family. I was only trying to become a person everyone could be 9 of. I wanted to go downstairs, say sorry for my rude behavior and for every refused movie and tennis game, and be 10 of my family again, I knew I had to do something-because without their support, my achievement meant nothing. | ||||
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