如图，AB是⊙O的一条弦，点C是⊙O上一动点，且∠ACB=30°，点E、F分别是AC、BC的中点，直线EF与⊙O交于G、H两点，若⊙O的半径为9，则GE+FH的最大值为．

   Last night I had a wonderful dream. I ____  that I turned into a good swimmer.
In my dream, the weather ____  fine and I came to a nice beach. There were few people on the beach and I ____  to swim in the sea. While I was swimming, some ____  fish followed me all the time. When I stopped, they came to swam ____  me. Then, one of the fish began to talk with me. It ____  Chinese, too! We had a wonderful conversation. Soon we became good ____  and it invited me to visit the place where they lived.
____  I heard a voice, “Weiwei, it’s time to get up! Breakfast is ready!” It was Mom’s voice. Just then I woke up from my sweet dream ____  had to face the real world again.
   My dream was ____  like a cartoon film, wasn’t it?

给下面的字选择正确的读音。

倚____靠（yǐ  qí）    瞠____目（chēng  táng）

旱涝____（láo  lào）   迈____步（mài  wàn）

关于生活中的化学，下列说法正确的是（　　）

（1）取少量Fe₂O₃粉末（红棕色）加入适量盐酸，反应的离子方程式为____ ．反应后得到棕黄色的FeCl₃溶液．用此溶液做以下实验：

（2）取少量溶液置于试管中，滴入NaOH溶液，看到有红褐色沉淀生成，反应的离子方程式为____ ．

（3）在小烧杯中加入25mL蒸馏水，加热至沸腾后，向沸水中加入2mL FeCl₃饱和溶液，继续煮沸至溶液呈____ 色，即可制得Fe（OH）₃胶体．

（4）另取一小烧杯也加入25mL蒸馏水后，向烧杯中也加入2mL FeCl₃饱和溶液，振荡均匀后，将此烧杯（编号甲）与盛有Fe（OH）₃胶体的烧杯（编号乙）一起放置暗处，分别用激光笔照射烧杯中的液体，可以看到____ 烧杯中会产生丁达尔效应．此实验可以区别____ ．

（5）取乙烧杯中少量Fe（OH）₃胶体置于试管中，向试管中滴加一定量的稀盐酸，边滴边振荡，可以看到的现象是____ 、____ ，此变化的离子方程式为____ ．

（6）已知明矾能净水，理由是____ ．