课程咨询

GRE首页 GRE课程 GRE动态 0元讲座 GRE模考网站

新东方在线 > GRE > GRE阅读 > 正文
扫码关注掌握一手留学资讯

扫码关注掌握一手留学资讯

回复XDF免费领

水平测试和备考资料

扫码关注公众号

GRE阅读模拟在线练习附答案二百二十五

2019-01-18 11:11:33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】

　　The whole biosphere, like the individual organisms that live inside it, exists in a chemically dynamic states. In this homeostatic system. a great number of organic compounds are synthesized, transformed, and decomposed continuously; together, these processes constitute the major parts of the carbon cycle, For the smooth operation of this cycle, degradation is just as important as synthesis, the green plants produce great quantities of polymers, such as cellulose, and innumerable other compounds like alkaloids, terpenes, and fiavonoids, that green plants cannot use as sources of energy during respiration. The release of the carbon in these compounds for recycling depends almost entirely on the action of both aerobic and anaerobic bacteria and certain types of fungi. Some bacteria and fungi possess the unique and extremely important biochemical asset of being able to catalyze the oxidation of numerous inert products, thereby initiating reaction sequences that produce carbon dioxide and so return much carbon to a form that actively enters into life cycles once again.

　　The passage contains information that would answer which of the following questions about the carbon cycle?

　　Ⅰ What are some of the compounds that are broken down in the carbon cycle?

　　Ⅱ Why are some compounds that are involved in the carbon cycle less reactive than others?

　　Ⅲ What role do bacterial and fungi play in the carbon cycle?

　　A.Ⅰ only

　　B.Ⅱ only

　　C.Ⅲ only

　　D.Ⅰand Ⅱ only

　　E.Ⅰand Ⅲ only

　　The author implies that which of the following is the primary reason that degradation is as important as synthesis to the smooth operation of the carbon cycle?

　　A.Most of the polymers and organic compounds found in the plant kingdom are chemically unstable.

　　B.The synthesis of some organic material deprives life processes of an energy source.

　　C.Decomposition permits the recycling of carbon that would otherwise be fixed in certain substances.

　　D.Many organisms cannot use plats as a source of food, but can feed on bacteria and fungi.

　　E.Bacteria and fungi could not survive if some carbon compounds were not degraded.

　　The author's contention about the importance of bacteria and fungi in the production of energy for life processes would be most clearly strengthened if which of the following were found to be true?

　　A.Both aerobes and anaerobes provide sources of energy through the decomposition of organic material.

　　B.Most compounds containing carbon are unavailable as energy sources except to some bacteria and fungi.

　　C.Bacteria and fungi break down inert material in ways that do not involve oxidation.

　　D.Many compounds remain inert, even in the presence of bacteria and fungi.

　　E.Bacteria and fungi assist in the synthesis of many organic compounds.

本文关键字: GRE阅读 GRE阅读练习

上一页 1 2 下一页

添加新东方美研助教回复【GRE】获取

模考真题|写作题库|阅读机经|佛脚词汇

更多资料

添加美研助教号，
回复【GRE】获取备考必看资料包

  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加美研助教号】，回复对应关键字领取学习资料。
更多>>
更多内容

关注新东方美研助教

回复【GRE】获取备考必看资料包

新东方美研备考资料
更多>>
更多惊喜>>

添加美研助教号，
回复【GRE】获取备考必看资料包

  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加美研助教号】，回复对应关键字领取学习资料。
更多>>
更多资料
我要
反馈 返回
首页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10