观察如图，回答问题：（1）图中的细菌和真菌是生态系统中的______．（2）细菌和真菌把动植物遗体分解成______、______和______，这些物质又能被植物吸收和利用，进而制造______．自

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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
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• You_____a teacher. I_____a student. My sister_____a student, too. [ ]A. am; is; are B. is; are; amC.
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