Keys ______ used for ______ the doors. [ ]A. is, openingB. is, opened C. are, opening D. are opened

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• 生物圈养育着万物生灵，人和各种生物共同生活在这个大家庭里，它们各自承担着不同的角色．下面承担分解者角色的是（）①淡水中的衣藻②高山上的油松③土壤中的细菌④朽木上的蘑菇⑤树-生物
• You ______ do it if you really don’t want to.A．can’tB．couldn’tC．needn’tD．mustn’t-九年级英语
• —There’s going to ______ a concert in the hall tonight. —Yes, and the last performance will be given
• There ________ a ruler and two pens on the desk.[ ]A. isB. areC. amD. be-七年级英语
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• —Listen! Is that Pingping playing the guitar? —No. It __________be Pingping. He has gone to Beijing
• —I hear you’ve got a new iPhone 4S. ______ I have a look?—Yes, certainly.A．MayB．DoC．ShallD．Should-九年
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• 生态系统的组成的成分包括非生物的物质和能量、生产者、消费者和分解者。其中非生物的物质和能量、生产者和分解者在生态系统中起着非常重要的作用。为验证它们的重要性，设计-八年级生物
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• 细菌和真菌等微生物在生态系统中占有重要地位，这主要是因为它们能（）A．释放氧气，吸收代谢废物B．为其它生物提供食物来源C．净化环境D．将有机物分解为无机物，促进自然界中的物-生物
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• 下列关于生态系统的叙述中，错误的是（）A．生态系统的结构由生产者、消费者和分解者三种成分组成B．生态系统中的能量最终都以热量形式散发到大气中C．森林生态系统的自动调节能力-生物
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• 一个完整的生态系统的组成应包括．（）A．全部的食物链和食物网B．生产者、消费者和分解者C．各种动物、植物和阳光D．非生物部分和生物部分-生物
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• 地球上生物生命活动所需的能量几乎都是由植物光合作用提供的，因此可以说，地球上生物所需能量的最终来源都是（）A．化学能B．太阳能C．地热能D．植物能-生物
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