2. 考研
  3. A. help maintain environmental quality B. as people clear lands C. depends on countless interactions D. by overfishing and by po

A. help maintain environmental quality B. as people clear lands C. depends on countless interactions D. by overfishing and by po

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问题 A. help maintain environmental quality
B. as people clear lands
C. depends on countless interactions
D. by overfishing and by pollution
Phrases:
A.【T13】______for homes and farms and cut wood for fuel
B. They also【T14】______by breaking down or removing some pollutants
C. fish supplies have been greatly reduced【T15】______
D.【T16】______among plants, animals, and microorganisms
    Wildlife plays a vital role in the biological processes that are essential to life itself. The functioning of the biosphere, and hence the maintenance of human life,【T17】______These processes are essential for agriculture, fisheries, and other efforts necessary to human life.【T18】______and by preventing the pile-up of waste. Some of the biological processes in which wildlife is involved are seed scattering, soil generation, nutrient cycling and pest control.
    No discussion of threats to wildlife is complete without an examination of the causes, which are human needs. In Africa, forests are shrinking【T19】______Sheep eat the vegetation, leaving the bare soil to be carried away by wind and water. Humans kill wildlife for the illegal trade in furs. The loss of forests is destructive to many species and plants. Beyond that, in the oceans,【T20】______
【T17】
选项 A、 
B、 
C、 
D、 
答案D
解析 前面说的是：生物圈的功能发挥以及人类生命维持。后面用“depend on…”表明条件。故选D。
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