2013高中英语 Unit21 Human Biology Section Ⅳ 专题练习课下作业 北师大版选修7.doc

【三维设计】2013高中英语 unit21 human biology section 专题练习课下作业 北师大版选修7.用适当的情态动词填空1tom comes from australia and he can speak english very well.2i heard you bought a new book. may i have a look?3if you can pass the driving test, you shall get a new car.4it is sunny today; we neednt take an umbrella.5would you like to have a dinner with me?6must we finish the composition in class?no, you neednt/dont_have_to.7you neednt read that book if you dont want to.8must/need i water the trees on tuesday?no, you neednt.9he is so strong that i dare_not fight against him.10we ought_to have received the letter yesterday, but it didnt arrive.完成句子1菲利普可能已经在交通事故中严重受伤了。philip may_(might)_have_been_hurt seriously in the car accident.2她不需要上场了，因为比赛被取消了。she didnt_need_to_play because the match was cancelled.3他本没必要带食物来聚会的，因为足够了。he neednt_have_brought any food to the party because there was plenty already.4汤姆一定已经吃了蛋糕了，因为他的嘴上有些蛋糕。tom must_have_eaten the cake, for there is some on his mouth.5如果你跟着他学，你本可以向他学到更多东西的。you might_have_learned more from him, if you had followed him.单项填空1although this _ sound like a simple task, great care is needed.amustbmaycshall dshould解析：选b。句意：尽管这听起来像是很简单的任务，但细心还是必要的。may表推测“可能”。2there is no light on they _ be at home.amustnt bcantcneednt dshouldnt解析：选b。句意：灯不亮他们不可能在家。can用于否定句或疑问句中，表推测“(不)可能”，must表推测时，不用于疑问句或否定句中。3who _ it be that is knocking at the door?it _ be father, but im not sure.acan; must bmust; canccan; may dmay; must解析：选c。第一个空can用于疑问句中表推测；第二个空受im not sure限制，只能用may表推测“可能”；must表推测“一定”。4she was a good swimmer, so she _ swim to the river bank when the boat sank.acould bmightcshall dwas able to解析：选d。句意：她游泳游得很好，所以小船下沉的时候她能游到河岸。could和was able to都表能力，但could表示一般的能力，表示过去有能力并干成了某事只用was/were able to。5why _ we eat outside _ we have so much delicious food at home?amust; when bcan; whilecwill; as dshould; though解析：选a。句意：既然我们家里有这么多好吃的东西，干嘛偏要出去吃呢？must表示“偏要，偏偏”；when在这里是“既然”的意思。6he did not regret saying what he did but felt that he _ it differently.acould express bwould expressccould have expressed dmust have expressed解析：选c。考查情态动词。句意：他并不遗憾说了他做的事，而是感觉他本来能用不同的方式表达。could have done sth.意为“本来能够做某事，其实没做”，符合语境，故选c。7the little girl _ go downstairs alone when her parents were out.adidnt dare to bdared notcdare not to ddare not解析：选b。考查情态动词。句意：当她的父母不在家时，这个小女孩不敢单独到楼下。dare作情态动词时后面要跟动词原形，排除c；而d时态不对，排除d；而a项中dare用作实义动词，后面应用动词原形。8if you had spoken to him last time you saw him, you _ what to do now.awould have known bshould have knowncwould know dmay know解析：选c。考查虚拟语气。句意：如果上次你见他时跟他说话，现在你就知道做什么了。根据语境可知主句是对现在情况的一种虚拟，要用would动词原形，故选c。9what do you think we can do for our aged parents? you _ do anything except to be with them and be yourself.amustnt boughtnt tocdont have to dcant解析：选c。考查情态动词。句意：“你认为我们能为我们年老的父母做些什么”“除了陪他们并且自己好好的，你没有必要做任何事”。dont have to do“没有必要做某事”，符合语境，故选c。10you _ further into this matter. if so, you _ know who did it now.amust have enquired; willbshould have enquired; wouldccould have enquired; will