动物是人类生活的好帮手，将下列动物及其“本领”用直线连起来。①啄木鸟A．田野卫士②猫头鹰B．森林医生③喜鹊C．捕鱼能手④黄鼠狼D．灭鼠益兽⑤鸬鹚E．捕鼠能手-八年级生物

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• 植食动物在生物圈中充当什么角色[]A．分解者B．生产者C．消费者D．自养生物-八年级生物
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• 用细菌和真菌作为生物杀虫剂治虫，可减少农药的用量，减轻对环境的污染，这种方法也属于生物防治。下列不属于生物防治的是[]A．苏云金杆菌杀棉铃虫B．用粘蝇纸毒杀苍蝇C．白僵菌-八年级生物
• 鼠兔是青藏高原上广泛分布的一种小型无尾的兔类，在许多人眼里认为它和家畜争夺草场，导致高山草地退化。因此，鼠兔一直被人类所毒杀。其实，鼠兔是青藏高原生态系统的关键性-八年级生物
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