(一)通过学习,我们已经掌握了一些气体的制备方法,如制取氧气的方法有:
甲.分离液体空气; 乙.加热分解高锰酸钾; 丙.分解过氧化氢; 丁.加热分解氯酸钾等;也初步认识了一些气体的制取和收集装置,例如:
从方框中选词并用其适当形式填空
(1)My pen pal ____ a brother and a sister. (2)Larry ____ math because she thinks it’s difficult. (3)The Greens ____ from the USA. (4)Please write and ____ me about your country. (5)This is a ____ robot(机器人). It can do a lot of things.