[解析]
（1）easier 细节理解题，根据 However； its actually quite important to know to sort your waste because not knowing how to sort waste can make it harder to save energy end protect the environment．它实际上是相当重要的知道分类你的废物，因为不知道如何分类废物会使它更难节约能源和保护环境，可知如果我们知道如何处理浪费，我们就更容易节约能源和保护环境，故答案为 easier．
（2）the pollution of environment 内容理解题，答案不唯一，言之有理即可，题目询问电子垃圾会给我们带来什么问题，根据Harmful waste includes things like medicine， batteries and fluorescent bulbs，可知电子垃圾可能会污染环境，故答案为the pollution of environment．
（3）three years 细节理解题，根据Shanghai announced in July that within three years，all of its citizens should sort their waste into four groups，可知要花3年的时间，故答案为three years．
（4）Wet waste 内容理解题，根据 Wet waste is also known as household waste． "It is the thing you don't want but pigs can eat"湿垃圾也被称为生活垃圾．《广州日报》解释说："这是你不想要的东西，但猪可以吃，可知it指代湿垃圾，故答案为Wet waste．
（5）sort the trash and protect the environment 主旨大意题，根据Now that you know this， perhaps you can do your part to protect the environment and encourage others to sort their waste，可知本文主要讲述了垃圾分类对环保的重要性，也介绍了在中国的很多城市已经开始进行垃圾分类，其目的是告诉人们垃圾分类，保护环境，故答案为sort the trash and protect the environment．
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