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练习： 1 .Why are ants compared to ecosystem engineers? 为什么蚂蚁叫生态系统工程师? A Because they build their own nests. 因为他们建立自己的巢。 B Because they collect food. 因为他们收集食物。 C Because their activity affects the environment. 因为他们的活动影响环境。 D Because they are predators. 因为它们是掠食者。 2. As predators, ants作为食肉动物，蚂蚁 A prey on small as well as large animals. 捕食小型以及大型动物。 B collect nutritious food from the soil收集的土壤营养食品 C collect food as decomposers. 收集食物分解。 D prey on species much higher up the food chain. 捕食物种更高的食物链。 3. Dir Sanders study centered on how ants迪尔桑德斯的研究集中在如何蚂蚁 A can manage to thrive in huge numbers. 经营蓬勃发展，大量。 B defend their resources and territory against other predators. 捍卫自己的资源和领土对其他食肉动物。 C attack those invading animals for survival. 攻击入侵的动物生存。 D produce such a big impact on the environment. 产生这样一个大环境影响。 4. What does paragraph 6 tell us? 6段告诉我们什么? | 
