Li Lei ______ a Chinese boy.[ ]A. am B. is C. are D. be -七年级英语

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• 如图是真菌、腐生细菌等在物质循环中的作用示意图，请据图回答下列问题．（1）图中腐生细菌的生殖方式是______；图中的家兔、鹿等动物在生态系统的组成中属于______．（2）绿色植物-生物
• 如图是某生态系统的简单示意图，请据图分析回答：（1）图中的禾谷类、水草能制造有机物，是生态系统的______，而昆虫、兔、鹰、鱼等是生态系统的消费者．（2）该生态系统中，禾谷类-八年级生物
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• 单句改错。( )1. How much is these black pants?A B CD( )2. Do you need bags for sports and school? A B CD(
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• The CDs ____________ in the drawer(抽屉). [ ]A. amB. isC. are-七年级英语
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• 如图为生态系统各个成分间的相互关系．下列有关说法错误的是（）A．A是生产者，它能够将无机物转变为有机物B．B为消费者，它和C的关系为消费关系C．C是分解者，它对生态系统的物质-生物
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• Look! Some oranges ______ on the table and there ______ some orange in the bottle. [ ]A. is;isB. is;
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