题目

用所给单词的适当形式填空（1）The film The Legend of Silk boy is very interesting. But I have seen it only （one）.（2）Look, the children are (swim) on a rope.（3）On Sundays the girl often (help) some old men do some housework.（4）We do morning (exercise) at school every day.（5）My mother usually goes (shop) in the morning. 答案：【1】once【2】swimming【3】helps【4】exercises【5】shopping14．下列说法中错误的是（　　）A．煤中含有苯和甲苯，可用分馏的方法把它们分离出来B．含C18以上的重油经催化裂化可以得到汽油C．天然气的主要成分是甲烷，开采天然气应做到安全规范的操作D．石油中含有C5～C11的烷烃，可以通过石油的分馏得到汽油