题目

我国的垃圾分类（waste sorting）正处于起步阶段, 垃圾分类势在必行。下面是关于垃圾分类的相关信息, 请将其补充完整, 每空一词。When throwing away rubbish, do you know which bin it should go in? Have you ever noticed the differently-colored bins【1】 the street?Some of you might not be able to answer this【2】. However, it’s actually quite important to know how to sort your waste. 【3】you don’t sort your rubbish, all of it will go to a landfill and be buried（埋）together．“Wet” waste is known as household waste. “They are things设nA为阿伏加德罗常数的值，下列说法正确的是(相对原子质量：C－l2   H－1) A．2.24L NO2含有0.2nA个氧原子 B．常温常压下，C2H4和C3H6组成的28g混合气体中含4nA个氢原子 C．1 molC2H6分子中含有7nA个极性键 D．常温下pH=13的NaOH溶液中含有的0.1 nA个OH－