I spent a lot of time ______ English last weekend.A. to practice speaking B. practicing to speak C.

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• 词形变化。1. Mr. Smith and his family _______ (be) in the park now. 2. Do you go _______ (fish) at the we
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• 如图展示一片森林中常见的生物现象，请分析回答下列问题：（1）一片森林可以看做一个______，其组成包括了这一地域内的所有生物和______．（2）图中树皮里有昆虫的幼虫，那么昆虫幼-生物
• 生态系统的能量流动是伴随着下列哪项进行的[]A．生产者B．消费者C．分解者D．物质循环-八年级生物
• 虎、豹等大型食肉性动物，在种类和数量上均比其它动物少得多，造成这种现象的主要原因是（）A．它们的繁殖能力低B．栖息场所有限C．被人类大量捕杀D．在食物链中所处的营养级较高-生物
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• As we’re students, we __________ obey the school rules.A．canB．mayC．mustD．could-九年级英语
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• 选择填空。—______ you like The Sound of Music?— Yes. ______ interesting. [ ]A．do, it's B．Do, It'
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• 如果用一个小型生态瓶模拟一个生态系统，设计实验时，不需要考虑的因素是（）A．外界氧气B．光照C．瓶内生物的种类和数量D．温度-生物
• 王亮在做校园调查时，作了如下记录：在一棵阴湿的、一侧干枯轻微腐烂的大树下，观察到：腐烂的树干上及露出的树根旁长了一些蘑菇；树冠向阳的一侧，树叶比较茂盛，嫩叶上见到了-生物
• Don't go out to play. You ________ finish your homework first. [ ]A. must B. have C. had D. had
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• 单项填空。Canada, the U.S., the U.K. and Australia ______ English-speaking countries. [ ]A. is B. are C.
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• 人类在生态系统中扮演的角色是（）A．生产者B．生产者和消费者C．消费者D．消费者和分解者-生物
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• If you are in the zoo, remember not to touch or go near the animals. Although some of the animals ar
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• 如图表示某个生态系统中各种成分之间的关系，图中的①所代表的成分名称是（）A．生产者B．消费者C．分解者D．非生物的物质和能量-生物
• —What's in the reading room?— There a teacher, twenty desks and thirty chairs in it. [ ]A. am B