下列有关物质的分离提纯的方法和操作正确的是（ ）
A．用分液漏斗分离水和四氯化碳的混合物时，四氯化碳从上口倒出
B．用溶解、过滤的方法分离KNO3和NaCl的混合物
C．可以用酒精萃取碘水中的碘
D．海水通过蒸馏可制得淡水，海水通过蒸发可得到粗盐
A．四氯化碳密度比水大，应从下口流出，故A错误；
B．KNO3和NaCl都溶于水，不能用过滤的方法分离，可用重结晶的方法分离，故B错误；
C．酒精与会互溶，不能用作萃取剂，故C错误；
D．蒸发海水可得到粗盐，蒸馏海水可得到蒸馏水，故D正确．
故选D．
 The other day my daughter finally had a day off work. We decided to go out in the 16 for the time, together! It was an enjoyable experience. Then a surprising thing happened. She turned and asked, “Hey, Dad, can I 17 the boat?” I had a look of fear in my eyes 18 the boat can be driven at a very high speed and can be turned over very quickly. However, I gave the driving seat to her and began 19 her how to properly control the boat. I told her to remain calm as I had completely believed in her. It can be both frightening and exciting when your child tries doing something, even if it’s a small thing, you still feel like they are growing up too fast and it’s out of your 20 . Time goes by so quickly, so it’s 21 to spend time with your kids, with your family. It is an amazing feeling to experience as their confidence grows. In every situation if you relax, take your time, and show confidence, you will have a great 22 . We not only had a 23 morning on the boat, but also invited our little neighbour who is 8 years old and put him in the 24 right between us. As I drove at top speed, making sudden turns and jumping over the waves, all I could hear was my neighbour 25 and screaming at the top of his voice because he was having such a great time.
|