GRE阅读练习每日一篇(四十一)_GRE阅读

GRE阅读练习每日一篇(四十一)

　　Vents are colonized by some of the same animals found in other areas of the ocean floor.

　　Vent water does not contain sufficient quantities of hydrogen sulfide.

　　Bacteria cannot produce large quantities of food quickly enough.

　　Large concentrations of minerals are found in vent water.

　　Some bacteria found in the vents are incapable of chemosynthesis.

　　20. Which of the following is information supplied in the passage that would support the statement that the food supplies necessary to sustain vent communities must be many times that of ordinary fallout?

　　I. Large vent faunas move from vent to vent in search of food.

　　II. Vent faunas are not able to consume food produced by photosynthesis.

　　III. Vents are more densely populated than are other deep-sea areas.

　　I only

　　III only

　　I and II only

　　II and III only

　　I, II, and III

　　21. The author refers to smokers most probably in order to

　　show how thermal shock can provide food for some vent faunas by stunning small animals

　　prove that the habitat of most deep-sea animals is limited to warm-water vents

　　explain how bacteria carry out chemosynthesis

　　demonstrate how advection compensates for the lack of food sources on the seafloor

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GRE阅读练习每日一篇(四十一)

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