— How was the youth club last night, Mark? — It was great fun. You ______ come. [ ]A. must B. can C.

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• Both you and Igood teachers. [ ]A. are B. is C. amD. was -九年级英语
• 在自然界，生物之间的信息交流是普遍存在的．正是由于______、______、______的存在，使生物之间的联系错综复杂，生物与环境才成为统一的整体．-生物
• 自然界中的虎、豹等大型肉食动物，在种类和数量上均比其他动物少得多，造成这种现象的主要原因是（）A．大型肉食动物繁殖能力低B．它们在食物链中所处的营养级较高C．这些动物被人-生物
• --What do you think of the book you borrowed from the library yesterday?--I have no idea. I_________
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• 一个生态系统，无论大小都是由（）A．生产者，消费者，分解者组成B．植物，动物，细菌，真菌组成C．生物部分和非生物部分组成D．阳光，空气，水组成-生物
• 如图为某生态系中部分食物网图．请回答：（1）图中绿色植物进行光合作用的场所是细胞中的______，绿色植物是生态系统中的______者；（2）在该生态系统中含能量最多的生物类群是___-生物
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• The light is on in Mr. Green’s room. He _______ be at home.A．mustB．canC．mustn’tD．can’t-九年级英语
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• There ______ a number of people in the airport. The number of people who travel by plane ______ larg
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• 小科同学走近一鱼塘边的某一位置时，鱼塘中的鲤鱼便会成群地向他游来，并逐渐向他聚集，如图所示．（1）对此现象的解释最合理的是______．A．鲤鱼本身具有亲近人的特性B．鲤鱼本身-生物
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