3.5.1前缀il-，ir-=not（不，非，相反或缺乏）【音频】【p53】
1. He's been ill for two weeks. 他病了两个星期了.
2. It's illegal to carry guns in our country.在我们国家，携带枪支是违法的.
3. l He is the only legal heir of the rich man.他是这位富翁的唯一法定继承人.
4. They were shot when trying to cross the frontier illegally. 他们在企图偷越国境时被击毙.
5. You must be illiterate if you've never heard of Marx. 要是你连马克思这个人都从未听说过, 那么你一定是文盲了..
6. Every literate person should read this book. 凡有文化的人都该一读此书.
7. A literal translation is not always the closest to the original meaning.逐字翻译不一定最接近原义.
8. This money will help the development of literacy in developing countries. 这笔钱将有助于提高发展中国家的文化水平.
9. Ba jin is a literary giant.巴金是一位文坛巨匠.
10. This book is titled An Introduction to American Literature. 这本书名为《美国文学指南》.
11. Fill in your answers in capital letters, not small letters. 答案用大写字母填写, 不要用小写字母.
12. It seems illogical to change the timetable so often.时间表变动得如此频繁，似乎没有什么道理.
13. Is it a logical necessity that higher wages will lead to higher prices?工资一高物价就高，这是不是合乎逻辑的必然规律?
14. She tested the whole class on irregular verbs.她对全班学生进行不规则动词测验.
15. I am a regular reader of this newspaper.我是这份报纸的长期读者.
16. They meet with great regularity.他们定期会面.
17. The activities of credit companies are regulated by law. 信贷公司的业务受法律制约.
18. The rule is that someone must be on duty at all times. 按照规定, 任何时候均需有人值班.
19. He reminded me not to forget to bring my ruler.他提醒我别忘了带尺子.
20. It's cheaper to ship goods by road than by rail.公路运输比铁路运输便宜.