2017年5月27日托福阅读真题+题目+答案：Groundwater Depletion

2017年5月27日托福阅读真题+题目+答案：Groundwater Depletion

Of the 2.4 percent of the world’s water that is fresh, nearly 90 percent is tied up in glaciers, ice caps and snowfields. ▋After glaciers, the next largest reservoir of fresh water is held in the ground as groundwater. ▋Groundwater is the source of nearly 40 percent of the fresh water for agricultural and domestic use in the United States. ▋Nearly half of all Americas and about 95 of the rural population depend on groundwater for drinking and other domestic purposes.▋ Overuse of these supplies causes several kinds of problems, including the drying up of wells and natural springs and the disappearance of surface water features such as wetlands, rivers, and lakes.

1.Paragraph 1 answers which of the following questions about groundwater?

A.How much of the fresh water supply in the United States is in frozen form?

B.Why is more groundwater used by the rural than the nonrural population?

C.What are the consequences when groundwater supplies diminish?

D.In what areas of the United States is the overuse of groundwater a problem?

In many areas of the United States, groundwater is being withdrawn from aquifers – layers of earth or rock that yield water – faster than natural recharge can replace it. On a local level, this causes a cone of depression in the water table, the upper level of ground water below which the earth is saturated with water. A heavily pumped well can lower the local water table so that shallower wells go dry. On a broader scale, heavy pumping can deplete a whole aquifer. The Ogallala Aquifer, for example, underlies eight states in the arid high plains between Texas and North Dakota. As deep as 400 meters (1,200 feet) in its center, this porous bed of sand, gravel, and sandstone once held more water than all the freshwater lakes, streams, and rivers on Earth. Excessive pumping for irrigation and other uses has removed so much water that wells have dried up in many places, and farms, ranches, even whole towns are being abandoned.

2.Which of the following can be inferred from paragraph 2 about the drying up of wells?

A.Wells that draw on large aquifers, such as the Ogallala, are not likely to go dry unless the entire aquifer is depleted.

B.In many areas of the United States, the levels of the water table varies seasonally, often causing wells to dry up temporarily.

C.A well in one place can go dry because of overpumping from another, deeper, well located in a different part of the aquifer.

D.A well the dries up because of a cone of depression in the local water table will probably recharge itself within a few years.

3.According to paragraph 2, which of the following is NOT true of the Ogallala Aquifer today?

A.It reaches a depth of four hundred meters.

B.It contains more water than all the freshwater lakes, streams, and rivers on Earth.

C.It stretches beneath a vast area covering eight states.

D.It is made up of sand, gravel, and sandstone.

。。。。。余下托福阅读真题原文及题目答案省略！

2017年5月27日托福阅读真题+题目+答案：Groundwater Depletion完整版下载，10元有偿！