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GRE阅读模拟在线练习附答案二百四十八

2019-04-25 15:36:14来源：网络

　　对于GRE阅读部分，最好的练习资料就是模拟资料。通过模拟练习，可以让大家更好地发现自己在备考中的不足，重点攻克自己的短板内容，有效的提升阅读分数。下面新东方在线GRE频道为大家整理了详细的内容，供大家参考。

点击查看》》》【GRE阅读真题在线练习附答案汇总】

　　While it is true that living organisms are profoundlyaffected by their environment, it is equallyimportant to remember that many organisms arealso capable of altering their habitat significantly, sometimes limiting their own growth. The influenceof the biological component of an ecosystem isoften greater in fresh waters that in marine orterrestrial systems, because of the small size ofmany fresh water bodies. Many of the important effects of organisms are related to theirphysiology, especially growth and respiration. By their growth many species can depleteessential nutrients within the system. Thus limiting the irown growth or that of otherspecies.Lund has demonstrated that in LakeWindermere the alga Asterionella is unable to growin conditions that it itself has created. Once a year, in the spring, this plant starts to growrapidly in the lake, using up so much silica from the water that by late spring there is no longerenough to maintain its own growth. The population decreases dramatically as a result.

　　Which of the following is an example of the type of organism described in lines 2-5?

　　A.A kind of ant that feeds on the sweet juice exuded by the twigs of a species of thorn treethat grows in dry areas.

　　B.A kind of fish that, after growing to maturity in the ocean, returns to fresh water.

　　C.A kind of flower that has markings distinctly perceptible in ultraviolet light to the speciesof bee that pollinates the flower.

　　D.A kind of tree with seeds that germinate readily only in a sunny spot and then develop intomature trees that shade the area below them.

　　E.A kind of butterfly, itself nonpoisonous, with the same markings as a kind of butterfly thatbirds refuse to eat because it is

　　It can be inferred from the passage that which of the followings is true aboutAsterionella plants in Lake Windermere?

　　A.They are not present except in early spring.

　　B.They contribute silica to the waters as they grow.

　　C.They are food for other organisms.

　　D.They form a silica-rich layer on the lake bottom

　　E.Their growth peaks in the spring.

　　The passage indicates that organisms frequently have the strongest effects on theirenvironment in

　　A.oceans, since oceans contain the largest organisms living on Earth

　　B.oceans, since oceans provide habitats for many different kinds of species

　　C.freshwater bodies, since such effects become pronounced in relatively small spaces

　　D freshwater lakes, since nutrients in freshwater lakes are present only in small amounts

　　E.land areas, since there exist major influences of climate on the kinds of small organismssupported in land areas

　　The primary topic of the passage is the way in which

　　A.organisms are affected by the amount of nutrients available

　　B.organisms can change their own surroundings

　　C.elements of freshwater habitats impede the growth of small organisms

　　D.the reproduction of organisms is controlled by factors in the environment

　　E.plant matter in a given locale can increase up to a limit

　　正确答案:D E C B

　　以上就是关于“GRE阅读模拟在线练习附答案二百四十八”的内容，更多精彩内容，请关注GRE频道!

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