题目内容
20．“Did you make the cake yourself？”Jim asked Alice．（改为宾语从句）Jim asked Alicewhether/ifshe had made the cake herself．
分析 “你自己做了蛋糕吗？”吉姆问爱丽丝．
吉姆问爱丽丝她是否自己做了蛋糕．
解答 答案：whether/if she．从句是一般疑问句，改为宾语从句，用whether/if作为引导词，后加陈述语序，原句中的第二人称换成与主句的宾语Alice一致的代词she，故答案是whether/if she．
点评 本题旨在考查宾语从句这一语法，做这类题时，要从三方面考虑：一、选准连接词 二、连接词后紧跟从句的主语 三、若主句是过去时，从句要改为相对应的过去时．还要注意人称和时间状语的变换．
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根据短文内容填空，每句词数不限．
The first important way is that they provide man with food，wood and other products．Trees provide not only man with food，but also many animals with food．Without trees many animals could not live on the earth．It's not easy for man to live on the earth，either．
The second important way is that trees give us shade（阴凉处）．On a hot summer day，people are looking forward to having a rest under the shade of a tree after they have walked a long way．You can imagine how important the shade of a tree is to man and to animals．
The third important way is that trees help to prevent drought（旱灾） and floods（水灾）．However，in many parts of the world，man has not realized the third important way．They cut trees down in large numbers．There will be fewer trees in the future．
People should protect trees，or they will find that they have lost the best friends they had in the end．
根据短文内容填空，每句词数不限．
| Trees are useful to man in（81）3/threeimportant ways． | Trees provide man with（82）food，wood and other products． |
| Trees give man shade on a（83）hotsummer day． | |
| Trees help to（84）preventdrought and floods． | |
| If people don't protect trees，they will find they have lost（85）the best friends they had． | |
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