The doctor suggested that the old man ______ an operation without delay. [ ]A. must have B. to haveC

更多内容推荐

• It is required that you _____ at six. [ ]A. will arrive B. arrive C. arrived D. would arrive -高二英语
• He commanded that he students _____ the classroom before he returned.[ ]A. didn't leave B. woul
• The boss commanded that the task _____ before 5 o'clock this afternoon. [ ]A. was finished B. f
• I suggested to my father that we________to Dalian for a holiday this summer, but the expression on h
• I _____to the party_____ at all possible, but I was fully occupied last night. [ ]A. should have gon
• Many students suggested that the school reading room _____open during the vacation. [ ]A. keptB. be
• If I _____ plan to do anything I want to, I'd like to go to Tibet and travel through as much of
• One of the requirements for a fire is that the material ____ to its burning temperature. [ ]A. is he
• I insisted that a doctor _____ immediately. [ ]A. has been sent forB. sends forC. will be sent forD.
• —Do you want him to lend you some money?— I wish he _____. [ ]A. should B. would C. will D. had -高二英
• — Why didn't you go to the dance last night? — If I _____tired, I would have. [ ]A. were notB.
• It is politely _____ by the hotel management that loud music _____ after 11 o'clock at night. [
• 下面是兴趣小组的同学设计的两个实验装置，都是用来观察植物的蒸腾作用的，请你根据示意图分析解决问题：（1）甲乙两个实验装置中______更合理、科学．理由是______．（2）保护森林-八年级生物
• 植物体内水的散失，主要以______的形式，通过叶的______进行的．-七年级生物
• 把一刚折下的果树枝插入小瓶中，如图所示，用弹簧秤测得重为5N，光照6小时后，测得重为4.8N．其重量减少的主要原因是（），又单独测得枝条的重量稍有增加，增加的原因是（）A．蒸-生物
• 据报道，科学家发明了一种无色透明的低粘性蜡状塑料．在移栽植物时，若将其喷在叶面上，则能结成一层能让二氧化碳通过而水分不能通过的薄膜，可大大提高植株的成活率．这主要因-生物
• 叶片和外界进行气体交换的“窗户”是______．-生物
• 关于保卫细胞的说法不正确的是（）A．保卫细胞的形状可以调节B．两个保卫细胞可围成气孔C．保卫细胞内没有叶绿体D．保卫细胞有些呈半月形-生物
• 下面几种植物中，宜选作植物蒸腾作用实验材料的是（）A．雪松B．仙人掌C．天竺葵D．睡莲-生物
• 保卫细胞的作用是（）A．保护作用B．控制气孔开闭C．保卫气孔D．吸收水分-生物
• 下表是对某地区小麦在不同时期需水量的测量数据．请分析：时期天数需水总量（米3/公顷）返青期29636拔节期23875抽穗期20956灌浆期311192（1）计算表中各个时期每天的需水量，并以直-生物
• 下列说法正确的是（）A．植树造林会消耗大量的地下水，会加重旱情B．植物的蒸腾作用散失大量的水分，是一种浪费C．植物的气孔很小，因此，通过气孔散失的水分很少D．在植物体内，水-生物
• 下图为某同学设计的探究绿色植物蒸腾作用的两套实验装置，请分析回答：（1）如果让你来验证植物的蒸腾作用，你选用一套装置？______不选另一套的理由是______．（2）为保证实验效果-生物
• 温带地区冬季寒冷，大部分树木叶片要脱落，落叶的原因是（）A．减少蒸腾B．植物体内水分的吸收和运输增强C．光合作用减弱D．呼吸作用加强-生物
• 如图表示植物体内有关生理作用示意图，其中①、②为相关气体．请回答：（1）若②代表水蒸气，则水蒸气是通过______作用散失到大气中去的．叶片上气体散失的“窗口”是______，该结构主-生物
• 关于植物呼吸、运输和利用水分的叙述，错误的是（）A．吸收水分的主要部位是在根尖的成熟区B．植物吸收的水分大部分用于光合作用C．茎内运输水分主要靠导管来完成D．蒸腾作用失水主-生物
• 春季植树时，移栽的树苗常被剪去大量的枝叶，这是为了降低树苗的呼吸作用．______．-生物
• 植物与外界进行气体交换以及水分散失的“门户”是（）A．表皮B．气孔C．保卫细胞D．叶脉-生物
• 植物蒸腾作用的意义是（）A．排出多余水B．散热C．促进物质运输D．以上三项都是-生物
• 移栽幼苗时要尽量带土的原因是（）A．防止水分的蒸发B．避免根暴露在空气中C．防止幼根和根毛损伤D．保持土壤中原有的养分-生物
• 下列不利于移栽植物成活的是（）A．带土移栽B．选择阴雨天移栽C．剪去部分枝叶移栽D．选择光照最强的时候移栽-生物
• 据报道，科学家发明了一类无色透明塑料、低粘性蜡等物质，在移栽植物时，若将其喷到叶面上，则能结成一层二氧化碳可以通过而水分不易通过的薄膜，能大大提高植株的成活率．这-生物
• 关于蒸腾作用的叙述正确的是[]A．蒸腾作用能带动植物体对水分的吸收以及水和无机盐的向上运输B．蒸腾作用的结果是把植物体内的水全部散失掉C．蒸腾作用只有在炎热的夏天才会表现-七年级生物
• 移栽植物时，可采用科学技术，把一种无色液体喷到植物的叶面上，形成一层二氧化碳可以通过，而水不能通过的薄膜，从而提高移栽植物的成活率，这其中的道理是[]A．促进光合作用-七年级生物
• 园林工人在移栽树苗后，常常在树苗上方加装黑色网罩以提高成活率。该做法应用的原理是[]A．减缓土壤水分的蒸发B．降低蒸腾作用的强度C．提高呼吸作用的效率D．降低光合作用的强度-八年级生物
• 俗话说“水往低处流”，可植物体内水分却是自下而上的，其运输的动力是[]A．太阳光能B．渗透作用C．植物体内产生的能量D．蒸腾作用产生的拉力-七年级生物
• 炎热的夏季，树林里却空气湿润，凉爽宜人，这是因为树木的蒸腾作用，提高了空气的________，降低了空气的________。-七年级生物
• 果树吸收的水分主要用于[]A．光合作用B．果实的长大C．植株的生长D．蒸腾作用-七年级生物
• If only I _____to my parents' advice![ ]A. listening B. listen C. am listening D. had listened
• If you _____ at school, you _____ a college student now. [ ]A. had studied hard; would have been B.
• It was required by the headmaster that all the students _____at the meeting. [ ]A. should presentB.
• I would love_____ to the concert last night, but I didn't get the ticket for it. [ ]A. to goB.
• —Mary's got crazy and has been sent to the mental hospital. Did you tell her boss about that? —
• —If he _____, he _____ that poisonous food. — Luckily he came back to life immediately. [ ]A. was wa
• — Did Betty go shopping with you yesterday? — Even if she _____ a lot of studying, she would have pr
• — Could you please tell us about some good ways to learn English? — My suggestion is that reading of
• —I didn't tell my parents the secret yesterday.— But you _____. [ ]A. ought to do B. ought toC.
• Mike ______ his car, for he came to work by bus this morning. [ ]A. can have found B. could have fou
• — Did you hand in your application for a league member?— Not yet. If I _____ to see my father, I wou
• It was suggested that the meeting _____ the next day.[ ]A. be held B. must be heldC. held D. should