生态系统由______部分和______部分组成．生物部分包括：______、______、______．-七年级生物

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• 如图是某市产粮（水稻）区的一个生态系统中各种生物关系的部分示意图，请依此图分析作答：（1）在此生态系统中，没有显示成分的是______．（2）这个生态系统的食物网中共有______条食-七年级生物
• 如图为一个池塘生态系统示意图，池塘内有水草、浮萍、水绵、鱼、虾等生物，请分析回答：（1）在该生态系统中，消费者有______．图中没有画出的生物部分是______，它们在生态系统-七年级生物
• “稻花香里说丰年，听取蛙声一片”，这是南宋诗人辛弃疾的千古名句．它描绘了美丽的田园风光，也道出农田生态系统中“丰年”与“蛙声”的某种关系，请你根据生态学的有关知识回答：（-七年级生物
• 将下列句子变为否定句。1. She's a tall girl. ____________________________. 2. It's yours, too. _______
• You ________ play with the knife. You ________hurt yourself.A．mustn’t; mayB．mustn’t; mustC．shouldn’t
• You had better _________ wine because you have to drive back home.A．not drinkB．don’t drinkC．not to d
• Her nameAlice.[ ]A. amB. is C. areD. be-七年级英语
• In the classroom there ________ a teacher’s desk and some desks and chairs .[ ]A. is B. are C. be-七年
• --- What’s on the table ?--- There ________ some apples.[ ]A. have B. is C. are-七年级英语
• -_________ the elephants African?-Yes, they____________. [ ]A. Are, areB. Do, doC. Is, isD. Does, do
• 下列食物链不正确的是（）A．青虫→山雀→雀鹰B．牧草→野兔→狐狸C．水草→小虾→黑鱼D．草→蝗虫→山雀→雀鹰-七年级生物
• －Must I go and get some water now?－No, you __________.A．needn'tB．may notC．mustn'tD．don�
• －_________ we go at 7.30 ? －What about __________ it a little earlier ?A．Shall ,makingB．Shall , to
• 如图表示某农田中生活的几种生物，请据图回答：（1）这个生态系统的能量来自稻的______作用所固定的______．（2）该农田生态系统的生产者是______；在该生态系统中，没有画出的生物-六年级生物
• 下列各项中，属于生产者的是（）A．能生产产品的工人B．能制造食物的加工厂C．能制造有机物的植物D．能吸收树干营养的真菌-七年级生物
• You_____a teacher. I_____a student. My sister_____a student, too. [ ]A. am; is; are B. is; are; amC.
• What the students doing?[ ]A. is B. areC. doD. does-七年级英语
• ---Is John coming by train? ---He should, but he ________ not. He likes driving his car.A．mustB．canC
• —Where _____ the flowers?—They are on the floor.[ ]A. is B. be C. am D. are-七年级英语
• Li Lei can’t go hiking with us today,because he take care of his sick mother.A．has toB．mayC．mustn’tD
• ----:I get up at five o'clock tomorrow morning?----: No, you.A．Must; can'tB．Must; needn�
• －Mum, must I stay there the whole day?－No, you__________. You__________ come back after lunch, of yo
• Look! ______ Some fishon the table, and some apples ______ in the box. [ ]A. is;areB. are;isC. are;a
• The boy ______healthy ________he cloesn’t like to exercise.[ ]A. doesn't ; so B. isn't ; s
• 句型转换。 1. He started dancing at the age of four.(改为同义句)He started dancing_____ ______ ___________ ___
• _________you ___________for England tomorrow?[ ]A. Do; leave B. Will; leaving C. Are; leaving D. Do;
• 蘑菇在生态系统中属于（）A．分解者B．消费者C．生产者D．植物-七年级生物
• 菟丝子是一种缺乏叶绿素的开花植物，可吸附于其他绿色植物上以取得养分，故菟丝子在生态系统中的角色是（）A．生产者B．分解者C．消费者D．既是分解者又是消费者-九年级生物
• 人在生态系统中担任的角色是（）A．生产者B．消费者C．生产者和消费者D．分解者-七年级生物
• ）The red bike _______be Hu’s. She has a blue bike.A．mustB．mightC．canD．can’t-九年级英语
• —Where_____ my football?—It is under the chair.[ ]A. is B. are C. be D. am-七年级英语
• Is that your best friend Kitty?— No, it _________ be her. She flew to Singapore yesterday.A．mustB．ca
• －Is Mr. Li in his office ?－No, he __________ in the office. He’s ill in hospital.A．must beB．can’t b
• —Listen! Is that Millie singing?—No. It _____ be Millie. She has gone to Beijing.A．mayB．can’tC．must
• Some teenagers would rather _____ than _______ in their spare time.A．play computer games, doing exe
• –Must I finish my homework tonight?-No, you______.A．Can’tB．Mustn’tC．needn’tD．may not-九年级英语
• You'd better ____ football in the street.A．playB．not playC．not to playD．plays-八年级英语
• —Who's the No. 1footballer in the English Premier League(英超联赛). —Beckham _____, I think.[ ]A. w
• 一个池塘内有水草、浮萍、水绵、鱼、虾、河蚌等生物，共同组成一个生态系统．（1）该生态系统中能量和有机物的来源分别是______、______．（2）水草和水绵在此生态系统中的是_____-七年级生物
• 流行性感冒的病原体属于生态系统的（）A．分解者B．消费者C．生产者D．以上都是-七年级生物
• 农作物对该生态系统的主要意义不包括（）A．决定系统中其它所有生物的命运B．为其它生物提供能量C．为生态系统提供有机物和新鲜空气D．决定鸡猪等生物的数量-七年级生物
• 句型转换1. The library isin front of the science lab (就画线部分提问) ?2. There are some pears in Li Lei's
• Must I move the table? No, you _____________.A．may not B．needn'tC．mustn't D．aren't-八年
• The price of the socks ________5 yuan.[ ]A. does B. do C. isD. are-七年级英语
• –May I take these books out of the reading room?-- No, you _________.A．won’tB．don’tC．mustn’tD．needn
• --- Do you have any plans for this weekend?--- I’m not sure. I _____ go climbing Mount Baoshi.A．must
• 按括号内要求完成各题。1.They are going to visit Mr. Wang tonight. (改为否定句)They _____ going to visit Mr.Wang toni
• —Must I park my car behind the building?—No, you _______. You _______ park it there.A.mustn’t; mayB.