要组成一个生态系统，必须要具有下列哪些成分？（）A．生产者和消费者B．生产者和分解者C．生产者、消费者、分解者D．生物部分和非生物部分-生物

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• --- Another cup of coffee? ---No. thanks. I _____ be off. Marry is waiting for me.A．canB．mayC．mustD
• 假设你流落在不毛的孤岛上，只有少量玉米和鸡可以食用，那么使你自己活得最长的办法是（）A．先吃鸡，然后吃玉米B．先吃玉米，然后吃鸡C．用玉米喂鸡，然后吃鸡D．用玉米喂鸡，先吃-生物
• According to the new traffic laws, peopledrive after drinking wine or beer.A．mustn’tB．won’tC．needn&#
• 用方框内适当的词填空。am, is, are, do, does, am not, isn't, aren't, don't1. What_______your fath
• —What sweet music!—Yes, it ______ really beautiful.[ ]A. listens B. listens toC. sounds-八年级英语
• —Where ____ they from?—They’re from China.[ ]A. isB. amC. are-七年级英语
• —willyoufinishdoingthework?—In a fewweeks.A．HowlongB．How farC．How soonD．How often-九年级英语
• 如图表示能量流动方向示意图，请据图回答：（1）图中①表示植物的______作用，它将太阳光能转变成储存在植物体内有机物中的能量，这个过程在细胞的______中进行．（2）在图中①和②的-生物
• He____know the answer, but I’m not sure.A．maybeB．may beC．mayD．must-八年级英语
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• 如图若为生态系统，则图中没有画出的生物成分是（）A．生产者B．消费者C．分解者D．生产者和消费者-生物
• ________you play the violin?A．AreB．CanC．IsD．When-八年级英语
• —Where______my keys?—Sorry,______. [ ]A. is;I don't knowB. are; I don't knowC. are; it
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• 单句改错。( )1.WhatthisinEnglish? A B CD()2.Isthisyou pencil case? A BC D ()3.Isthathisa room? A B C D___
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• 根据下面的文字及生态系统中的食物关系图回答有关问题：森林里生活着高大的乔木、低矮的灌木、草本植物等绿色植物．有许多鸟类在此栖息，有的鸟吃草籽，有的鸟是杂食性鸟（既吃-生物
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• my school ID card.A．This’sB．that’sC．this isD．That’s-七年级英语
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