It's the library!So youknow shouting is not allowed here.[ ]A. canB. mustC. needD. may-九年级英语

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• 生态系统中的物质和能量沿着_______和_________流动。-七年级生物
• —This pair of shoesbelong to Jack. He likes this kind very much. —It __ be his. It's too large
• 生态系统的物质循环是[]A．周而复始B．单向流动C．逐级递减D．逐级增加-八年级生物
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• — May I taste the cake? — No, youwash your hands first. [ ]A. need B. can C. may D. must -九年级英语
• Tom ______ some carrots for lunch. [ ]A. can has B. can haveC. is has D. does have -七年级英语
• —Must I leave now? —You _ [ ]A. needn’t B. mustn’t C. won’t D. must-九年级英语
• 在一片稻田中，人们总是尽可能的让能量流向[]A．稻子B．所有植物C．所有生物D．人类-八年级生物
• 生态系统能量流动的特点是__________和__________。越向食物链的后端，生物体的数量越__________，储存的能量也越___________，就形成了__________生物体数量和
• You have walked such a long way on such a hot day. You __________ be tired and thirsty.[ ]A. canB. m
• —What are you going to do tomorrow?—I’m not sure. I____ make a trip to Hanzhou with my girl friend.[
• —Look !It _ be Mr Zhang. —No, it _be Mr Zhang.He has gone to Paris. [ ]A. may; must B. must; can C.
• 大气中的氧气、二氧化碳、水等物质会随着大气在全球范围内活动，不会局限在某一个生态系统，这个现象说明___________。-七年级生物
• Thisbook______Lucy's.Look!Hernameisonthebook. [ ]A. mustbe B. maybe C. can'tbe D. mustn�
• 生态系统中能量流动的特点是[]A．双向流动，逐级递减B．单向流动，逐级递增C．循环流动，前后不变D．单向流动，逐级递减-八年级生物
• 图为某生态系统碳循环示意图，图中ABCD分别代表生态系统的成分，①--⑦代表碳元素的传递过程，请据图回答：(1)图中B是指_________，D是指__________。(2)碳元素在无机环境与生物-
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• Bob can't come out to play because he help Dad in the garden. [ ]A. canB. can't C. has to
• 生态系统的主要功能是[]A．能量流动和物质循环B．能量循环和物质流动C．能量积累和物质合成D．物质分解和能量释放-八年级生物
• 能量在食物链中的流动是逐级递减的。[]-七年级生物
• 如图是某农场创建的生态型种养殖模式图。据图分析，下列说法错误的是[]A．蔬菜在白天能为牛提供氧气B．蔬菜在白天只能进行光合作用C．蔬菜可以作为牛的食物D．牛粪可以作为蔬菜的-八年级生物
• —Could you go swimming with us this afternoon?—Sorry, I can't. I take care of my little sister
• 用must,might,could或can't填空1.It'stoolate;theybedoingtheexperiment? 2.ThelargeshoesbeJim'
• 下图是生态系统中物质循环图解，甲、乙、丙分别代表不同的生物类群，下列说法正确的是[]A．甲是生产者，乙是消费者，丙是分解者B．甲是生产者，乙是分解者，丙是消费者C．甲是分-七年级生物
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• 下图是生物圈中碳循环的示意图。下列有关叙述中不正确的是[]A．图中①表示的生理过程是光合作用B．图中③表示的生理过程是呼吸作用C．图中甲代表的生物腐生细菌和真菌等D．图中乙丙-八年级生物
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• My friend has lost his blue bike. This onehis.[ ]A. maybe B. must beC. might be D. is-九年级英语
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• 当食草动物摄取食物时，植物体内的能量就会全部流入动物体内。[]-八年级生物
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• _________是生态系统的能量来源。能量流动是从__________开始，其特点是__________。-八年级生物
• Mr. Green ______ speak a little Chinese, but he can't speak any Japanese.[ ]A. can B. may C. mu