Unit 11 Planting trees

典型例题

　【例1】按要求改写下列各句，每空一词，缩写算一词。

　　1. You must tie the tree to the top of the stick. （改为被动语态）

　　The tree _______ _______ ________ to the top of the stick.

　　2. The earth should be pushed down hard with your foot several times. （改为一般疑问句）

　　____ the earth ______ pushed down hard with your foot several times?

　　3. Must I finish my homework today? （改为被动语态）

　　_____ my homework ________ _______ today?

　　4. The students must keep the classroom clean and tidy every day. （改为含有被动语态的一般疑问句）

　　_____ the classroom _______ _______ _______ and tidy every day?

　　5. We should speak to the old man like that. （改为含有被动语态的否定句）

　　The old man ________ ________ ________ ________ like that.

　　答案：1. must be tired　2. should, be　3. must, be finished　4. Must, be kept clean

　　5. shouldn’t be spoken to

　　解析：在完成该题时，要注意保留原主动语态句中的情态动词，这样一来可以做到句意不变，在完成疑问句时，只需要将情态动词提前即可，be + 及物动词的过去分词结构保持不变。

　【例2】完形填空

　　Yesterday was Sunday. Mike’s grandpa decided to __1__ Mike to the forest. They set __2__ very early. Mother gave them a basket of food and said, “Now don’t forget __3__ breakfast at eight and lunch at one. I want you to come back home by six.” As they walked along, Mike suddenly stopped and asked, “How can we tell what time it is in the forest __4__ a watch?”

　　Grandpa laughed, “Don’t worry. We’ll tell __5__ the flowers.” Mike was surprised.

　　“Each flower opens its petals(花瓣) __6__ a certain time. It folds(合拢) them up again at a certain time, too. Look!” Grandpa pointed to a pool,“Those are water lilies(莲花). They wake up at eight o’clock every morning and open their petals __7__ the sun.”

　　That __8__ it was time for breakfast. Then they walked on. Time flew quickly in the forest. They had lunch and walked on again. Then Grandpa said, “It’s time __9__ back way home. Look, the water lily is folding its petals. That means it’s after four o’clock.” “Next year we’ll plant a __10__ clock in our garden.” Grandpa said on the way home.

　　(　)1. A. bring　　B. takes　　C. take　　D. bringing

　　(　)2. A. in　　　B. out　　　C. at　　　D. of

　　(　)3. A. to have　B. have　　C. has　　　D. having

　　(　)4. A. with　　B. without　C. in　　　D. before

　　(　)5. A. by　　　B. as　　　C. for　　　D. out

　　(　)6. A. on　　　B. after　　C. above　　D. at

　　(　)7. A. over　　B. below　　C. to　　　D. away

　　(　)8. A. mean　　B. means　　C. meant　D. meaning

　　(　)9. A. to go　　B. going　　C. went　　D. go

　　(　)10. A. grass　　B. stone　　C. flower　　D. wood

　　参考答案：

　　1. C　2. B　3. A　4. B　5. A　6. D　7. C　8. C　9. A　10. C

　　讲解与说明:

　　1．take sb. to sw. 的意思是“带某人去……”，故此题选C。

　　2．set out 是固定短语，意思是“ 出发”，故此题选B。

　　3．forget to do sth. 是一个固定句式，意思是“忘记了要做某事”，这里迈克的妈妈告诉他们不要忘记了要吃早饭和午饭， 故此题选A。

　　4．根据句意可知，迈克问爷爷，“在森林里没有手表怎么知道时间呢？” 故此题选B。

　　5．介词by 有“靠、凭借”等含义，故此题选A。

　　6．at a certain time是一个固定短语，意思是“在一定的时间”，故此题选D。

　　7．介词to 表示“朝……”或“ 向……”，故此题选C。

　　8．莲花开放意味着时间约在早晨八点左右，即是吃早饭的时间，又因宾语从句中的时态为一般过去时，所以此题选C。

　　9．It’s time to do sth 是固定句式，意思是“到做……的时间了”，故此题选A。

　　10．从文中可知，爷爷是根据花瓣开和合来估计时间的， 所以爷爷是想要种一棵花，把它当作时钟来用， 故此题选C。

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