为了探究“水的净化”过程，某实验小组从河中取了水样，观察到：A．水样呈黄色，有异味 B．水样浑浊，有固体小颗粒．
现对水样进行如下处理：
（1）向水样中加入明矾搅拌溶解，静置一段时间后，进行 _________ （填操作名称），除去固体小颗粒，在此操作中，玻璃棒所起的作用是 _________ ．再向滤液中加入活性炭，利用其 _________ 性除去水样中的颜色和异味，该过程属于 _________ 变化（填“物理”或“化学”）
（2）若过滤结束，发现滤液仍然浑浊，可能的原因是① _________ ②_________．
（3）同学们想知道所得滤液中是否溶解了某些固体物质，可接着对滤液进行_________（填操作方法）．实验室现有下列仪器和用品，要进行该操作，必须用到的是（填序号）_________．①试管 ②铁架台（带铁圈） ③烧杯 ④酒精灯 ⑤滤纸 ⑥玻璃棒 ⑦量筒 ⑧蒸发皿．
（1）过滤；引流；吸附；物理；
（2）滤纸破损；液体的液面高于滤纸边缘等；
（3）蒸发；②④⑥⑧
My mum only had one eye. She cooked for students and teachers to 41 the family when I was young. One day my mum came to 42 hello to me in primary school. I was so embarrassed（尴尬的） that I threw her a hateful 43 and ran out. The next day at school, one of my classmates said, “Your mum only has one eye!” and 44 at me. I hated my mum and decided to leave her, so I studied very hard. Later I got a chance to go abroad to study and I left my mother. 45 graduation I worked, bought a house and got 46 there. Then I had kids of my own. I was happy with my wife and my kids. But one day someone knocked at my door. It was my 47 !When she stood by the door, my children laughed at her, and I 48 at her, “How dare you come to my house and scare my children! GET OUT OF HERE NOW!” And to this, my mum 49 answered, “Oh, I’m so sorry. I may have got the wrong 50 ,”and she disappeared. One day, a letter regarding a school reunion（聚会） came to my house. So I told a 51 to my wife that I was going on a business trip. After the reunion, I went to the old house. My neighbours said that she 52 . I did not have a single tear. They handed me a letter that she had wanted me to have. My dearest son, I am thinking 53 you all the time. I’m sorry that I came to your house and scared your 54 . I was so glad when I heard you were coming for the reunion. But I may not be able to even get out of bed to see you. I’m sorry that I was still an embarrassment to you when you were growing up. You see…when you were very little, you got into an accident, and lost your eye. As a mother, I couldn’t stand watching you grow up with one eye. So I gave you 55 . … With all my love to you! Your mother
|