分别取两份相同质量、相同浓度的过氧化氢溶液,其中一份(用A表示)直接加热制取氧气,在另一份(用B表示)中加入少量的二氧化锰,下列关于A、B的图像正确的是
more, and you'll improve your spoken English.
--- I've just got a postcard from my pen friend. --- Let me have a look. Wow.nice card!
--- What is your favourite sport? --- Swimming, I think. It's of all.
---I use your ruler, Lingling? --- Sure. Here you are.
--- Do you like watching TV? ---Yes, I. But only after I finish my homework.