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An ecosystem is defined as an ecological community together with its environment, functioning as a unit. To be more【C1】______an
An ecosystem is defined as an ecological community together with its environment, functioning as a unit. To be more【C1】______an
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2013-12-04
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问题
An ecosystem is defined as an ecological community together with its environment, functioning as a unit. To be more【C1】______an ecosystem is a complex set of relationships among the living resources, 【C2】______and residents of an area, composed of organisms that work together to remain healthy【C3】______energy is exchanged and system-level processes emerge. The ecosystem serves as the level of biological organization in which organisms【C4】______simultaneously with each other and with their environment. As such, ecosystems are a level above that of the ecological community but are at a level below the 【C5】______, which is essentially the largest of all possible ecosystems.
The thing about ecosystems is that they are 【C6】______ fragile and intensely complicated. If you influence the smallest variable, then it changes the 【C7】______This is why global warming is such a big issue, 【C8】______whether we created it or not. Ecosystems will change; however, if they change radically enough, our way of life will forever be affected. It is sad to think that future generations will not have the【C9】______of witnessing these little creatures as we have in our lifetime. You have to go to preservations to witness the wildlife that【C10】______be an everyday occurrence.
【C10】
选项
A、was about
B、had better
C、used to
D、would rather
答案
C
解析
be about to do:马上做;had better:最好(命令);used to:以前,曾经;would rather:宁愿,宁可。由于动物数量越来越少,从前每天都能看到的动物逐渐从视野消失,人们只好到保护区欣赏它们的身影。used to说明今非昔比,表达了一种无奈。
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