生态系统中，有毒物质通过食物链会________（填“增加”、“减少”或“不变”）。-七年级生物

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• -Must we clean the classroom now?-No, you _____.[ ]A. mustB. needn'tC. aren'tD. must not-八
• -Listen! Is that Kate playing the piano inthe room?-No. It _____be Kate. She has gone to London.[ ]A
• I _______ like some noodles.[ ]A. does B. hadC. would -九年级英语
• 农田中除草的目的是[]A．调节农田中生态系统的结构B．调节农田中生态系统的物种C．调节农田中生态系统的能量流动D．A和B-八年级生物
• 按要求完成句子。1. She can help you. (改为否定句) She ______________ you.2. He would like to play basketball with
• 施用农药DDT的地区，虽然占陆地面积的一部分，可是在远离施药地区的南极，动物体内也发现了DDT，这种现象说明了[]A．DDT是挥发性物质B．南极动物也偶尔到施用农药的地区寻找食-八年级生物
• 某湖泊中存在着4种不同的生物A、B、C、D。研究者对其体内的食物成分进行了分析，并将结果绘制成下表：请你回答。（1）根据上表提供的信息，以食物链的形式表示4种生物的取食关系-七年级生物
• 从“狼吃羊，羊吃草”看出，狼体内有机物最终来源于[]A．狼B．羊C．草D．光-七年级生物
• 图反映了生态系统各成分之间的相互关系，据图分析回答下列问题：（1）图中①的作用是制造__________，因此，①被称为生态系统中的__________。（2）图中消费者是标号[]和标号[]所示-七年
• —Could you play football with me this afternoon?.—I'm sorry. I babysit my sister.[ ]A. have toB
• You _______ drive on the left in Hong Kong.[ ]A. can B. mustC. have toD. do-八年级英语
• This dictionary mustn't _____from the library. Youcan only use it here. [ ]A. take awayB. taken
• -_I finish my homework today, Mum?-No, you _ . You can do it on Saturday. [ ]A. Must; don't hav
• -Will you go to the party with us?-I'm not sure, I ___ go to visit my grandma with my cousin.[
• —Must I return the book tomorrow? —No, you _____. You _____ keep it for a few days. [ ]A. mustn'
• — _______ you come to our piano lesson?—Sure. I'd love to.[ ]A. Are B. Do C. CanD. Must-八年级英语
• 生态系统中的能量最终都来自于_________。-八年级生物
• Henry ________ be at home because he phoned me from the farm just now.[ ]A. mustn'tB. might not
• — Where's Lucy, please?— She_____ be in the library.[ ]A. canB. needC. could D. may-九年级英语
• —_ you get some milk for me?—Sure.[ ]A. MayB. MustC. ShouldD. Could-八年级英语
• —_____you play the piano?—No. But I can play the violin.[ ]A. CanB. MayC. MustD. Should-八年级英语
• —Where is your father now?—I'm not sure．He _______ be in the kitchen． [ ]A. mayB. mustC. will D
• I can play basketball, but my sister _____. [ ]A. hasn'tB. can'tC. doesn't D. isn
• —Can you come to have dinner with me this evening? —I'm afraid not. I _______ take care of my g
• Jeff can't come to the party, because he'llhelp his sister with the housework.[ ]A. must B
• 大气中的_________是碳循环的主要形式。-八年级生物
• You_____ right.[ ]A. may beB. maybeC. can be-八年级英语
• Both of his parents died of illness so he support his family at the age of 14. [ ]A. mustB. shouldC.
• _____he is in reading room now. [ ]A. MaybeB. May be C. May-八年级英语
• —____I come in?—Comein ,please.[ ]A. MayB. MustC. NeedD. Have to-八年级英语
• The teacher gave back his homework, so he_ do it again.[ ]A. mustB. had toC. needed D. might-八年级英语
• —_________ you play golf ?—No. But I can play table tennis.[ ]A. Can B. May C. Must D. Should-八年级英语
• —You _____ be very tired after the long flight. —Yeah, though I am tired, I feel excited and happy.[
• 生态系统中的能量流动伴随着__________。-八年级生物
• Youkeep the book for a week.[ ] A. can B. have to C. must D. should-八年级英语
• Cathy said shespeak four languages.[ ]A. mayB. couldC. wouldD. can-八年级英语
• You________ be careful when you are driving atnight.[ ]A. can B.should C.wouldD. could-八年级英语
• Taking a boat to school _____ a lot more fun than taking a bus.[ ]A. must haveB. must be haveC. must
• Jim ________ back in ten minutes._______ he won't come back.[ ]A. maybe; May beB. may be; May b
• I’d like to go abroad for further study, but I _____afford it.[ ]A. don’t B. wasn’t able to C. can’t
• 单句改错。1. She should goes to bed early.2.—When did it start? —About two weeks before.3. She can sing g
• 流入植物体内的能量，一部分以______的形式散失，一部分则用于植物体的______、______和繁殖。-八年级生物
• I don't have enough money. Maybe Iget a part-time job.[ ]A. shouldB. shouldn'tC. shallD. h
• 按要求改写下列句子，每空一词。l. It seems that Kate has supper at home.（改为同义句） Kate________________have supper at h
• I'm sure he will ________ pass the exam.[ ]A. canB. couldC. is able toD. be able to-八年级英语
• -She looks tired. -Yes, she___________go to see a doctor.[ ]A. will B. maybeC. shouldD. must-八年级英语
• —Is the man in blue our headmaster? —It _____ be him. He has just left for Beijing.[ ]A. mustB. mayC
• 在生态系统中，能量是从固定_______开始的。-八年级生物
• —Hi, Jim,_ you come to my party?—Sorry, I can't. I have to do my homework.[ ]A. can B. may C. n
• —Who's that woman with Ann?—I'm not sure. It _____ be her mother.[ ]A. mayB. can C. must-九