—This pair of shoesbelong to Jack. He likes this kind very much. —It __ be his. It's too large

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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-
• 生产者为动物的生存提供____________；生态系统中各种____________之间是相互依存的。-七年级生物
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• 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'
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• Could you please _me the book?[ ]A. passed B. passC. to pass-九年级英语
• 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
• 根据下面的文字及生态系统中的食物关系图回答有关问题：森林里生活着高大的乔木、低矮的灌木、草本植物等绿色植物。有许多鸟类在此栖息，有的鸟吃草籽，有的鸟是杂食性鸟（既吃-八年级生物
• 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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• 下列关于生态系统中物质循环的说法不正确的是[]A．动物对生态系统中物质循环起促进作用B．光合作用和呼吸作用在物质循环中起促进作用C．生产者、分解者也参与物质循环D．物质循环-八年级生物
• —Is Lucy knocking at the door? —No. It ______ be Lucy. She is in Japan now. [ ]A. needn't B. mu
• You _swim in this river of the park. It's dangerous ![ ]A. mustn't B. needn't C. won&
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• 用所给词的适当形式填空。1. You(can) try to do it.2. He spent one hour (do) his homework.3. I saw her(play) when
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• 组成生物体的物质在________________之间的往返循环就是生态系统的物质循环。-八年级生物
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• Your mother looks a bit disappointed. You have told her the truth. [ ]A. doB. must C. can D. want-九年
• —_____ I do the laundry first?—No, you _____. You can do your homework first.[ ]A. Must;mustn't
• _________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
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• 某湖泊生态系统中，湖水中的DDT相对浓度为0.5×10-6，现发现各生物体内均有不同浓度的DDT，检测结果如下：检测对象ABCDEDDT浓度/×10-60.0052.00.575.50.04（1）5种
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• —You fly the kites very well.—Thank you. I________ kites when I was 7 years old.[ ]A. can flewB. cou
• It's raining hard outside, so they stay in the classroom.[ ]A. must B. can C. have to D. might-
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