新概念英语第二册课后练习答案lesson7.doc

新概念英语第二册课后习题答案详解Lesson 7练习答案 Key to written exercises1关键句型练习答案A detectives were waiting(1.1); They were expecting(1.2);detectives were waiting(1.5); others were waiting(1.6);two detectives were keeping guard(11.7-8)B 1 When the plane arrived, some of the detectives were waiting inside the main building while others were waiting on the airfield.2 When two of the detectives opened the parcel, two others were keeping guard at the door.C (sample answers)1 I was getting into my bath when you telephoned me.2 I was reading Hamlet when you saw me in the library this morning.3 I was saying that you must see the new film when you interruped me.D 1 was leavingarrived 2 worked/ was workingwas sitting/ sat3 was walkingmet4 was readingheard5 was preparingset/ was setting6 droppedspoke2难点练习答案1 He gave all his books away.2 She woke the children up early this morning.4 They cut the kings head off.5 Put your hat and coat on.7 Help me to lift this table up.8 Take your shoes off and put your slippers on.11 They have pulled the old building down.12 Make your mind up.14 She threw all those old newspapers away.3多项选择题答案1. b根据课文第3-4行someone had told the police that thieves would try to stealthe diamond 和第8-9行While two detectives were keeping guard at thedoor可以判断出b. to prevent a robbery 是正确答案，其他3个都不对。2. c根据课文最后一句话To their surprise, the precious parcel was full of stonesand sand! 可以推测出c. didnt prevent the robbery 是正确的答案。其他3个选择都不符合课文内容。3. c从回答中可以看出，此问句是对地点发问的， a. Why, b. When, d. What 都不能针对地点提问，只有c. Where是问地点的，可以用At the airport 来回答，所以选c.4. d这一句是针对动词宾语提问的，回答是用名词短语A valuable parcel of diamonds . a. Why, b.When , C. where 这几个疑问词都不能针对动词宾语（名词）提问的，只有d. What 可以对名词提问。5. a前面句子是过去完成时（hadtold）,表示在过去某一动作或情况发生之前完成的事情，“某人告诉警察。”这一事件一定是在“飞机到达之前”发生的。所以正确答案选a. before(在之前)6. ca. in后面需要有一个表示地点的名词，意思才完整；b. into在意思上讲不通；d. for后面需要有一个名词做宾语，意思才完整；只有c. inside(在里面)意思最完整，而且与前半句的动作went into the building相符合，所以选c.7. d4个选择中只有d. took it off 最符合题目意思和语法，所以选d.8. ab. waiting 是不及物动词，后面不能直接跟名词；c. expecting for 中的expect是及物动词，后面不能加for; d. expecting to 中expect后面不能加to; 只有a. expecting最符合语法。9. c本句需要选一个与前句中的valuable(宝贵的，珍贵的)意思相同的形容词做表语。a. worth 可以做名词和形容词，意思是“价值”，“值得的”，不是valuable的同义词；b. worthy 是形容词，意思是“有价值的”“值得的”常于of 或不定式连用，不能单独做表语，也不是valuable的同义词；d. value 是名词，不符合词性；只有c. precious 是形容词，意思是“宝贵的”，“珍贵的”，是valuable的同义词,可以做表语，所以选c10. bc. take from , d. take to 都不符合语法；a. rob 和b. steal都有“窃取”的意思，但steal强调“偷偷地或悄悄地趁人不注意时窃取”，而rob则强调“通过武力明目张胆地盗窃或抢劫”。Steal这一动作的执行者应该是thief(小偷)，而rob的动作执行者却是robber(强盗)。因为本句的主语是thethieves,所以选b.11. a本句是要解释前一句中的 the main building(主楼)，b. smallest(最小的)；c. first(第一)；d.greatest(最伟大的)这3个选择都不符合词义，只有