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GRE·94-4考题——(3)

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时间:2005-11-15 23:10  208次点击 | 0 关注

It can be inferred from the passage
that which of the followings is true
about Asterionella plants in Lake
Windermere?
They are not present except in early
spring.
They contribute silica to the waters
as they grow.
They are food for other organisms.
They form a silica-rich layer on the
lake bottom.
Their growth peaks in the spring.

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答案:(E)
  尽管生物会深受其环境的影响是确凿无疑的,但同样重要的是,我们应记住,
许多生物也能极大地改变它们的栖息地,从而在某些情况下限制着它们自身的生
长。某一生态系统中的生物组成部分,其影响在淡水环境中要比在海洋或陆地系统
中经常要来得大,因为淡水中许多生物体的身体尺寸都很小。生物体所受到的许多
重要影响均与它们的生理形态有关,尤其是生物体的生长和呼吸。通过它们自身的
生长,许多生物种类能够减少该生态系统范围内具有重要意义的营养物,从而限制
它们自身的生长或其它生物种类的生长。伦德(Lund) 证明,在温德尔湖(Lake
Windermere)中,硅藻属(Asterionella)这类水藻无法在它自身所创造的条件中
生长。每年一次,在春季,这类植物在湖中开始急剧生长,耗费掉水中如此之多的
二氧化硅,以至于至春季后期,再也没有充分的二氧化硅来维持它自身的生长。这
样一来,整个种群数量便急剧减少。

The passage indicates that organisms
frequently have the strongest effects
on their environment in
oceans, since oceans contain the
largest organisms living on Earth
oceans, since oceans provide
habitats for many different kinds
of species
freshwater bodies since such
effects become pronounced in relatively
small spaces
freshwater lakes, since nutrients
in freshwater lakes are present only
in small amounts
land areas. since there exist major
influences of climate on the kinds of
small organisms supported in land areas

————————————————————————
答案:(C)
  尽管生物会深受其环境的影响是确凿无疑的,但同样重要的是,我们应记住,
许多生物也能极大地改变它们的栖息地,从而在某些情况下限制着它们自身的生
长。某一生态系统中的生物组成部分,其影响在淡水环境中要比在海洋或陆地系统
中经常要来得大,因为淡水中许多生物体的身体尺寸都很小。生物体所受到的许多
重要影响均与它们的生理形态有关,尤其是生物体的生长和呼吸。通过它们自身的
生长,许多生物种类能够减少该生态系统范围内具有重要意义的营养物,从而限制
它们自身的生长或其它生物种类的生长。伦德(Lund) 证明,在温德尔湖(Lake
Windermere)中,硅藻属(Asterionella)这类水藻无法在它自身所创造的条件中
生长。每年一次,在春季,这类植物在湖中开始急剧生长,耗费掉水中如此之多的
二氧化硅,以至于至春季后期,再也没有充分的二氧化硅来维持它自身的生长。这
样一来,整个种群数量便急剧减少。

The primary topic of the passage is

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