题目

鉴别硫酸铜溶液与氢氧化铁胶体最简便的方法是( )A. 萃取 B. 蒸馏 C. 过滤 D. 丁达尔效应 答案：【答案】D【解析】试题分析：胶体和溶液的区别是：胶体具有丁达尔效应，而溶液不具备，可以据此来鉴别二者；选项D符合题意。请先阅读短文，然后根据短文内容从方框内所给的单词中选择恰当的词（注意词形变化）填入短文空白处，使短文完整、通顺。一词只用一次，一空限填一词。方框中有两个词是多余的。much, place, impossible, good, look, animal, another, describe, ourselves, pack,hard,theyWe have been in Australia for three days. We’re having a【1】________ time here. Australia is the sixth largest country in the world. There is so 【2】_____to see that it is 【3】___________ for me to tell you everything. Sydney is a beautiful city. There are many big trees and flowers around and they【4】________really beautiful. There are also some special【5】________in Australia, such as kangaroos and koalas. They are really lovely.During the past three days we’ve visited many【6】_________ of interest around Sydney. I’d like to spend more time here. But we will fly to【7】_________city, Cairns, to see coral beds(珊瑚礁) tomorrow. It is said that words can’t【8】_________the beauty of the colorful corals. Many famous cartoon films were made there. Now we are busy 【9】________our bags so that we will not lose time when we leave. We can enjoy 【10】___________in Cairns this time tomorrow. I’m looking forward to going there again!