假设某生态系统中有甲、乙、丙三种生物，他们的捕食关系如右图所示．那么该系统中属于生产者的是（）A．甲B．乙C．丙D．乙和丙-生物

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• — How was the youth club last night, Mark? — It was great fun. You ______ come. [ ]A. must B. can C.
• 据观察，蚯蚓在土壤中以植物枯叶、朽根为食，你认为它在生态系统中应属于（）A．生产者B．分解者C．消费者D．生产者兼消费者-生物
• — What are you looking for, Michelle?— My cousin's MP3 player. It ______ right in here, and now
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• 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
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• --What do you think of the book you borrowed from the library yesterday?--I have no idea. I_________
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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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