Unit 21

重点、难点练习题

　　１．Ｂ　２．Ｂ　３．Ｂ　４．Ｄ　５．Ｄ

全方位单元综合练习题

　　Ⅰ 1. idiom　2. woodcutter　3. progress　4. vocabulary　5. native

　　6. homeland　7. limited　8. rapid　9. encourage

　　Ⅱ (略)

　　Ⅲ １．Ｃ　２．Ｄ　３．Ａ　４．Ｃ　５．Ｄ

　　６．Ｂ ７．Ｂ　８．Ｃ　９．Ａ

　　Ⅳ （Ａ）１．Ｄ　２．Ｄ　３．Ａ　４．Ｃ　５．Ｃ ６．Ａ　７．Ｃ ８．Ｄ

　　（Ｂ）１．Ｃ　２．Ｄ　３．Ａ　４．Ｂ　５．Ｃ　６．Ｄ

　　Ⅴ 1. by practising speaking every day　2. the best at English in your class　3. will be lauched　4. came across　5. In the 1980s　6. have a talk with you　7. carefully enough　8. Keep on working　9. In the ye ars that followed　10. They gave some advice　11. how to do the experime nt　12. in their fifties　13. He kept on wiping his eyes　14 we had met before

　　Ⅵ(略)

　　Ⅶ 1. for　2. on　3. housing　4. hard　5. communism

　　6.political　7. supported　8. working　9. hated　10. another

　　Ⅷ １．Ｂ　２．Ｄ　３．Ｃ　４．Ａ　５．Ｄ

　　 Ⅸ 1. most→ the most　2. and → or　3. in →with　4. tape →tapes　5. to do →do　

　　6.√　7. which→that8. were are　9. many →much　10. to write → writing