问题
填空题
如图，上瓶盛的是空气，下瓶盛的是红棕色的二氧化氮气体．当抽出玻璃片后，会观察到红棕色气体逐渐扩散到上瓶，同时下瓶颜色逐渐______，此现象说明______．
答案
因为分子是不断运动的，空气中的分子和二氧化氮分子都在运动，最后两瓶中的气体颜色趋于一致．
故填：变浅；分子是不断运动的．
搜题请搜索小程序“爱下问搜题”
如图，上瓶盛的是空气，下瓶盛的是红棕色的二氧化氮气体．当抽出玻璃片后，会观察到红棕色气体逐渐扩散到上瓶，同时下瓶颜色逐渐______，此现象说明______．
因为分子是不断运动的，空气中的分子和二氧化氮分子都在运动，最后两瓶中的气体颜色趋于一致．
故填：变浅；分子是不断运动的．
阅读下面一篇短文，理解大意，然后从各小题的四个选项中选出一个最佳答案，使短文连贯完整。 One day before my final exam, my dad gave me a gift. It completely changed my life. On that day I had a with my friends and it was a difficult time with my studies. I was unhappy. Then I noticed the gift. I it and saw a DVD inside. Its name was “THE SECRET” However, I was in no mood (心情) to watch it. I sat down to study, but the in my life—the fight, the sleepless nights and my poor health…Everything came to my mind. I wanted an answer but I wondered there was any. Just then, I saw the DVD again. May be it would be helpful. I my DVD player. I had no words to describe the feelings I experienced while watching it. The moving (动人的) stories of human beings made me so moved that I wouldn’t any of them. Thanks to my father’s gift “THE SECRET”, I discovered . Everybody has difficulties in their lives. The important thing is that you should be enough to face them. Now I have started my studies and my friends. And I’m in good health, too. I often hear people say, “Wow! perfect life you have!”
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