问题
选择题
下列实验操作正确的是
A． B． C． D．
答案
答案：A
题目分析：本题难度不大，非常明显，B选项的加热中试管中液体太多，C选项中滴管的下嘴尖不能深入试管口，D选项中蒸发操作，蒸发皿被加热温度高，不能直接用手去拿取。故选择答案A。
点评：实验是化学的基本手段，所以正确的化学实验操作非常重要。
搜题请搜索小程序“爱下问搜题”
下列实验操作正确的是
A． B． C． D．
答案：A
题目分析：本题难度不大，非常明显，B选项的加热中试管中液体太多，C选项中滴管的下嘴尖不能深入试管口，D选项中蒸发操作，蒸发皿被加热温度高，不能直接用手去拿取。故选择答案A。
点评：实验是化学的基本手段，所以正确的化学实验操作非常重要。
| 完形填空。 | ||||
| When I was in the third grade, I was chosen to be the princess in the school play. For weeks my mother had helped me practise my lines. But once on the stage, every word 1 from my head. Then my teacher asked me to change my role to be a narrator (解说者) for the play. 2 I didn't tell my mother what had happened that day, she noticed my 3 and asked if I wanted to take a walk in the garden. It was a lovely spring day. We could see dandelions (蒲公英) popping (炸开) 4 the grass in bunches (束). I watched my mother bend down by one of the bunches. "I think I'll dig up (挖光) all these weeds (野 草)," she said. "From now on, we'll 5 have roses in this garden." "But I like dandelions," I protested (抗议). "All flowers are 6 -even dandelions!" My mother looked at me seriously. "Yes, every flower gives pleasure in its own way, doesn't it?" she asked thoughtfully. I nodded."And that is 7 of people, too," she added. When I 8 that she had guessed my pain, I started to cry and told her the truth. "But you will be a wonderful narrator," she said, 9 me of how much I loved to read stories' aloud. Thanks to my mother's encouragement, I got to know everybody had his or her own 10 in the world. I felt proud of the role in the play. | ||||
|