gre考试阅读真题解析(A)
20. It can be inferred from the passage that which of the following is true of the water locked in glaciers and ice sheets today?
It is richer in oxygen-18 than frozen water was during past glacial periods.
It is primarily located in the northern latitudes of the Earth.
Its ratio of oxygen isotopes is the same as that prevalent in seawater during the last ice age.
It is steadily decreasing in amount due to increased thawing during summer months.
In comparison with seawater, it is relatively poor in oxygen-18.
21. The discussion of the oxygen-isotope ratios in paragraph three of the passage suggests that which of the following must be assumed if the conclusions described in lines 49-58 are to be validly drawn?
The Earths overall annual precipitation rates do not dramatically increase or decrease over time.
The various chemicals dissolved in seawater have had the same concentrations over the past million years.
Natural processes unrelated to ice formation do not result in the formation of large quantities of oxygen-18.
Water molecules falling as precipitation usually fall on the open ocean rather than on continents or polar ice packs.
Increases in global temperature do not increase the amount of water that evaporates from the oceans.
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