环保学家和生物学家提倡保护要保护农田蜘蛛，因为农田蜘蛛可以[]A．吃掉农田中的害虫B．防治农田中的杂草C．给农作物传粉D．给农作物施肥-八年级生物

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• 下列关于动物在自然界中的作用叙述，不正确的是[]A．动物在生态平衡中起着重要作用B．动物能促进生态系统中的物质循环C．动物的数量越多，对植物的生长越有利D．动物能帮助植物传-八年级生物
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• (2014·湖南师大附中一模)The first successful space walk in 2013 is an important historical________in Chinese
• If you are looking for a ______, you can make it when it is on sale.A．priceB．bargainC．costD．bill-高一
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• 从20世纪40年代起，人们开始大量生产和使用六六六、DDT等剧毒杀虫剂以提高粮食产量，这些剧毒物质的确在短期内起到了杀虫的效果，粮食产量得到了空前的提高。然而，这些杀虫-八年级生物
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• 下列属于生产者和消费者之间的关系的是[]A．青蛙捕昆虫B．猫头鹰捉田鼠C．蝗虫吃庄稼D．麻雀吃虫子-八年级生物
• 许多动物都成了人类的盘中餐，有的人吃腻了平时常吃的动物，又把目光瞄准了野生动物，认为野味更有营养，更好吃。一些饭店也迎合这些人的口味，推出了一些野味菜肴，不少野生-八年级生物
• Next week there will be a basketball match between the ________ and the ________of our school. A．wom
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• Working hard is not only a _____ of great success, but it is among the essential requirement.A．sign
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• 家鼠是同学们熟悉的动物，下列对于家鼠的认识不正确的是[]A．家鼠在食物链或食物网中占据一环，过多过少对生态系统都会产生不良影响B．家鼠在帮助植物传播果实和种子方面有一定-八年级生物
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• As we know, too much ________ to Xrays can cause skin burns, cancer or other damage to the body.A．c
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