A Ants bring about a negative influence to an area when their population is small. 蚂蚁带来负面影响的地区时,他们的人口小。
B Ants bring about a positive influence to an area when their population is small. 蚂蚁带来积极影响的地区,其人口的小。
C Ants predation counteracts the positive influence they may have on an area. 蚂蚁捕食抵消了积极的影响,他们可能对一个地区。
D At higher density, ants produce a positive influence on an area. 在高密度,蚂蚁产生积极影响的地区。
5. What still remains unclear about ants, according to the last paragraph? 什么仍然不清楚蚂蚁,根据最后一段?
A What roles do ants play in the ecosystem in which they live? 做什么样的角色打蚂蚁在生态系统中生活
B How do ants affect the animal diversity in a given ecosystem? 蚂蚁是如何影响动物的多样性在一个特定的生态系统?
C How do human activities affect ants influence on a given ecosystem? 人类活动怎样影响蚂蚁的影响某一特定的生态系统?
D How do ants alter the physical and chemical environment? 蚂蚁是如何改变的物理和化学环境?
答案与题解:
1. C 短文的第一段提供了答案。A不是正确答案,因为并不是因为蚂蚁会筑巢才被誉为生态系统工程师,而是因为它们筑巢和获取食物的方式改变了土壤的营养水平,为整个食物链提供了很好的生态环境。
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