1. Eggs are classified according to size.
    鸡蛋按大小分等级。

2. No problem. Just sit down in front of your home computer or TV and enter what you want, when you want it, from an electronic catalogue containing thousands of titles.
    没问题。只要坐在家中的电脑或电视机前，在一个含有上千个条目的电子目录中输入你想要的东西和需要的时间就行了。

3. Help the boy to look up the book in the catalogue.
    请帮助这孩子在目录里找找这本书。

4. Advertisers have made a close study of human nature and have classified all our little weaknesses.
    已经仔细地研究了人的本性，并把人的弱点进行了分类。

5. You can buy these items through the catalogue.
    你可以从目录中买到这些项目.

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