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、分解者和食物网C．非生物部分、生产者、消费者D．非生物部分和生物部分-生物

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• —Two months ______ quite a long time.—Yes, I'm afraid that he will miss a lot of his lessons. [
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• 单项选择。—Whatthe score yesterday? — It 80:82. [ ]A. was, was B. is, is C. are, are D. were, were -七年级英语
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• —Let’s go dancing tonight.!—Sorry, I ________.I have to go to my guitar lesson. A. mustn’t B. needn’
• — Susan, would you like to go hiking with us this afternoon?— I'd love to, but Istudy for a tes
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• 非生物因素包括______、______、______、______、______、______等多种因素．-生物
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