Unformatted text preview: ore than 10,000 years ago and are no longer being recharged. 7. The word fractures in the passage is closest in meaning to ○streams
8. According to paragraph 6. Which of the following statements about aquifers in deserts is true? ○Water from limestone and sandstone aquifers is generally better to drink than water from sand and gravel aquifers ○Sand and gravel aquifers tend to contain less groundwater than limestone or sandstone aquifers
○Groundwater in deep aquifers is more likely to be recharged than groundwater in shallow aquifers
○Sedimentary rocks, because they are porous, are not capable of storing large amounts of groundwater
9. According to paragraph 6. the aquifers called fossil" waters ○contain fossils that are thousands of years old
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○took more than 10.000 years to become saturated with water ○have not gained or lost any water for thousands of years
○have been collecting water for the past 10,000 years
Paragraph 7 在 Water does not remain immobile in an aquifer but can seep out at springs or leak into other aquifers. The rate of movement may be very slow: in the Indus plain, the movement of saline (salty) ground waters has still not reached equilibrium after 70 years of being tapped. The mineral content of groundwater normally increases with the depth, but even quite shallow aquifers can be highly saline.
10. The word immobile in the passage is closest in meaning to ○enclosed
11. The passage supports which of the following statements about water in the desert? ○The most visible forms of water are not the most widespread forms of water in the desert.
○Groundwater in the desert cannot become a source of drinking water but can be used for irrigation.
○Most of the water in the desert is contained in shallow aquifers that are being rapidly recharged.
○Desert areas that lack endogenous or exogenous rivers and streams cannot support life.
Paragraph 4在Regularly flowing rivers and streams that originate within arid lands are known as "endogenous." These are generally fed by groundwater springs, and many issue from limestone massifs, such as the Atlas Mountains in Morocco. Basaltic rocks also support springs, notably at the Jabal AlArab on the JordanSyria border. ■Endogenous Rivers often do not reach the sea but drain into inland basins, where the water evaporates or is lost in the ground. ■Most desert streambeds are normally dry, but they occasionally receive large flows of water and sediment.■
Paragraph 5 在 Deserts contain large amounts of groundwater when compared to the amounts they hold in surface stores such as lakes and rivers. ■But only a small fraction of groundwater enters the hydrological cyclefeeding the flows of streams, maintaining lake levels, and being recharged (or refilled) through surface flows and rainwater. In recent years, groundwater has become an i...
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This note was uploaded on 09/17/2013 for the course LANGUAGE 13DL208 taught by Professor Wang during the Fall '13 term at East China Normal University.
- Fall '13