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
• 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
• To make our city more beautiful, rubbish __ into the river.[ ]A. needn't be thrownB. mustn'
• A lot of trees _______ in our town.[ ]A. should be planted B. plantedC. are planting-九年级英语
• -Dad, could I watch TV now?-Yes, _____. But you have to finish your homework first.[ ]A. you canB. y
• 下图为某森林生态系统碳循环示意图，图中A、B、C、D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-八年
• 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&
• 在生态系统中，有毒物质能够沿着食物链逐渐积累。[]-七年级生物
• 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
• 下图为生态系统物质循环过程，请据图填写。①____________②_________③__________④__________A__________B__________C__________-八
• 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
• —The room is so dirty. _____ we clean it? '—Of course.[ ]A. Let'sB. Would C. DoD. Shall-七年
• We'll get there at eight, but they _____.[ ]A. aren'tB. didn'tC. won'tD. don
• 在生态系统中的物质和就是沿着食物链和食物网流动的。-七年级生物
• 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
• 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
• Mr. Green ______ speak a little Chinese, but he can't speak any Japanese.[ ]A. can B. may C. mu
• 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
• 下表是对5种生物体内农药含量的测定结果，这些生物与生物之间有着吃与被吃的关系，请你分析，下列哪一条食物链的联系是正确的生物种类ABCDE单位体积农药含量（毫克）0.0450.-七年级生物
• —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-
• 用情态动词can， may， must的适当形式填空。1.—What _______ I do for you? —I want some apples.2.My father _______ride
• 生物的下列过程中，与碳循环无直接关系的是[]A．光合作用B．呼吸作用C．微生物分解作用D．蒸腾作用-八年级生物
• 下列是温带草原上的部分生物：A．植物B．鼠C．蛇D．鹰E．食虫鸟F．植食昆虫，它们通过食物形成的联系如下图。（1）请根据你掌握的知识把以上生物的代号填人方格内。（2）生态系统的四种-七年级生物
• 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
• —Can you come to Susan's party? —Sorry. I ________ look after my grandma.[ ]A. amB. have to C.
• -Must we clean the classroom now?-No, you _____.[ ]A. mustB. needn'tC. aren'tD. must not-八
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• 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
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• 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
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• —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
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• — _______ 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