托福阅读常考话题及练习题推荐一：地下水（2）

Paragraph 1: Groundwater is the word used to describe water that saturates the ground, filling all the available spaces. By far the most abundant type of groundwater is meteoric water; this is the groundwater that circulates as part of the water cycle. Ordinary meteoric water is water that has soaked into the ground from the surface, from precipitation (rain and snow) and from lakes and streams. There it remains, sometimes for long periods, before emerging at the surface again. At first thought it seems incredible that there can be enough space in the “solid” ground underfoot to hold all this water.

1. Which of the following can be inferred from paragraph 1 about the ground that we walk on?

A. It cannot hold rainwater for long periods of time.

B. It prevents most groundwater from circulating.

C. It has the capacity to store large amounts of water.

D. It absorbs most of the water it contains from rivers.

2. The word “incredible” in the passage is closest in meaning to

A. confusing

B. comforting

C. unbelievable

D. interesting

Paragraph 2: The necessary space is there, however, in many forms. The commonest spaces are those among the particles—sand grains and tiny pebbles—of loose, unconsolidated sand and gravel. Beds of this material, out of sight beneath the soil, are common. They are found wherever fast rivers carrying loads of coarse sediment once flowed. For example, as the great ice sheets that covered North America during the last ice age steadily melted away, huge volumes of water flowed from them. The water was always laden with pebbles, gravel, and sand, known as glacial outwash, that was deposited as the flow slowed down.

3. The word “out of sight” in the passage is closest in meaning to

A. far away

B. hidden

C. partly visible

D. discovered

4. According to paragraph 2, where is groundwater usually found?

A. Inside pieces of sand and gravel

B. On top of beds of rock

C. In fast rivers that are flowing beneath the soil

D. In spaces between pieces of sediment

5. The phrase “glacial outwash” in the passage refers to

A. fast rivers

B. glaciers

C. the huge volumes of water created by glacial melting

D. the particles carried in water from melting glaciers

Paragraph 3: The same thing happens to this day, though on a smaller scale, wherever a sediment-laden river or stream emerges from a mountain valley onto relatively flat land, dropping its load as the current slows: the water usually spreads out fanwise, depositing the sediment in the form of a smooth, fan-shaped slope. Sediments are also dropped where a river slows on entering a lake or the sea, the deposited sediments are on a lake floor or the seafloor at first, but will be located inland at some future date, when the sea level falls or the land rises; such beds are sometimes thousands of meters thick.

6. All of the following are mentioned in paragraph 3 as places that sediment-laden rivers can deposit their sediments EXCEPT

A. A mountain valley

B. Flat land

C. A lake floor

D. The seafloor

Paragraph 4: In lowland country almost any spot on the ground may overlie what was once the bed of a river that has since become buried by soil; if they are now below the water’s upper surface (the water table), the gravels and sands of the former riverbed, and its sandbars, will be saturated with groundwater.

7. The word “overlie” in the passage is closest in meaning to

A. cover

B. change

C. separate

D. surround