问题 填空题

实验室为了配制溶液;常用如右图所示的装制取净化程度较高的蒸馏水.

(1)在连接好装置后,应先进行______的操作,再加入水和沸石进行蒸馏;

(2)在烧瓶中加入沸石的目的是______.

答案

(1)在中学化学实验及有关实验设计习题中,经常涉及装置的气密性检验问题.一般说来,无论采用哪种装置,在成套装置组装完毕装入反应物之前,必须检查装置的气密性,以确保实验的顺利进行,故答案为:检查装置气密性;

(2)沸石的作用是起助沸作用,防止暴沸,因为沸石表面均有微孔,内有空气,所以可起助沸作用.故答案为:防止暴沸.

完形填空

阅读下列各小题,根据括号内的汉语提示,用句末括号内的英语单词完成句子,并将答案写在答题卡上的相应题号后。

小题1:We should encourage children to read classics, most of which                       (很有益处)to the growth of our children.(benefit)

小题2:I like these blue jacket very much; it costs______________________(三倍)the one hanging in the window. (as).

小题3:They say the accident happened because the carelessness of the driver, but in my opinion, it is the cyclist rather than the driver _____________________(应负责任).(blame)

小题4:_____________________ (一旦被发现偷东西)in the supermarket, any salesperson will be fired at once. (once)

小题5: Project Hope aims at helping more children in poor areas to          _  (有受教育的机会 ) .  (access,receive)

小题6:Never        (我碰到过)such a person. with a talent for songwriting in the past ten years.(come)

小题7:. If you were cast away on a deserted island,              (你会怎么办)? (do)

小题8: The headmaster left word with my parents                (他要来拜访)next Sunday . (pay)

小题9: After the war, a new school building was put up___________________________ (在曾经是一家剧院的地方). (where)

小题10:The officials were discussing the plan that they would like to see                (实现) the next year . (carry)

多项选择题