题目

If you’re a book lover，you have a pile of books on your bedside，or a bookshelf in your library with a“to read”sign on it．Yet you can’t stop yourself from adding to the pile．This can lead to feelings of guilt over your new purchases．But I’m here to tell you to stop worrying．What you have is an antilibrary，and it’s a very good thing．The term comes from writer Umberto Eco．He is the owner of a large personal library．He separates visitors into two groups：those who react with“Wow! What a library you have! How many of these books have you read?”and the others who区分下列各组物质的两种方法都合理的是（ ）选项需区分的物质方法一方法二A硬水和软水分别加入肥皂水蒸干比较固体的多少B硝酸铵和尿素加碱研磨，闻气味溶于水，观察是否吸热C黄金和黄铜加入硫酸锌溶液在空气中加热D二氧化碳和氮气分别通入澄清的石灰水分别伸入燃烧的木条