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　　新概念英语第一册课后练习及详解答案Lesson 21 Which book

　　：Read this dialogue. Fill in the missing words. 填空。

　　Paul: Give______ a knife ______, Susan.

　　Susan: ______one This ______

　　Paul: Is it sharp

　　Susan: No, it isn't ______. It's ______.

　　Paul: No, not that one. The______ one.

　　Susan: Here______ ______.

　　Paul: ______ you.

　　：Make pairs of opposites from the two boxes. Write them in the middle.从两框中挑出反义词，写在中间的横线上。

　　Now write short dialogues. 写出简短的对话。

　　1 (bottle/ large little) Give me the bottle, please. -Which one

　　The large one or the little one

　　2 (glass/full empty) _______________________________

　　3 (box/ new old) _______________________________

　　4 (knife/blunt sharp) _______________________________

　　：Write these numbers in figures. 用阿拉伯数字表示以下数词。

　　three hundred and thirty-three______ five hundred and sixty-five______

　　seven hundred and eighty-one______ nine hundred and forty-two______

　　a thousand and thirteen______ a thousand and seven______

　　A (Complete dialogue)

　　Paul: Give me a knife please, Susan.

　　Susan: Which one This one

　　Paul: Is it sharp

　　Susan: No, it isn't sharp. It's blunt.

　　Paul: No, not that one. The sharp one.

　　Susan: Here you are.

　　Paul: Thank you.

　　B

　　full - empty, new - old, sharp - blunt

　　2 Give me the glass, please. - Which one The full one or the empty one

　　3 Give me the box, please. - Which one The new one or the old one

　　4 Give me the knife, please. - Which one The blunt one or the sharp one

　　C

　　333, 565, 781, 942, 1,013, 1,007

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