B. In any language, some letters are used more than others.

　　C. Only people who know the keyword can read the message.

　　D. As long as there have been codes, people have tried to break them.

　　E. You can hide a message by having the first letters of each word spell it out.

　　F. With a code book, you might write down words that would stand for other words.

　　G. Another way to hide a message is to use symbols to stand for specific letters of the alphabet.

　　 Book 1 Modules 1-2

　　I. 根据汉语提示填空

　　1. embarrassed 2. diploma

　　3. technology

　　4. enthusiastic 5. comprehension

　　6. relaxed

　　7. serious

　　8. impression

　　9. topic 10. discipline

　　Ⅱ. 短语运用：

　　11. took part in

　　12. are similar to

　　13. be divided into

　　14. is true of

　　15. being knocked down

　　16. in other words

　　17. As a result

　　18. made great progress

　　19. fell asleep

　　20. introduced himself to

　　Ⅲ. 语法填空（2016全国卷Ⅰ）21. attraction

　　22. was allowed

　　23. officially

　　24. to

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