题目

 Not only should you get used _________ under difficult conditions but also you should pay more attention _________ your work well.        A. to work; to do                           B. to working; to doing        C. to work; to doing                        D. to working; to do 答案:B 碘是紫黑色晶体,可以溶解在汽油中,形成紫红色溶液. (1)碘溶解到汽油中,形成的溶液属于________(填“纯净物”或“混合物”),它具有________性和________性两大特征. (2)甲、乙、丙三个同学分别画出下面的示意图,表示溶液中碘分子的分布.(提示:汽油分子没有画出) ①如果乙同学的示意图符合事实,应该观察到的现象是________________; ②根据你在实验中观察到的现象,________(填甲、乙、丙)的示意图符合事实.
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