63. The passage mainly tells us ________.

　　A. how to get our arms and legs stronger

　　B. how to improve our memory

　　C. how to read and write

　　D. how to remember dates and prices

　　B

　　Africa is home to nearly 700 lakes and rivers. It holds the largest amount of water on earth. Because of the overuse of the lakes, natural climate changes and other factors (因素), these lakes are disappearing quickly.

　　Millions of people in Africa depend on water sources like lakes and rivers for their daily water. In other words, they cannot live without these lakes and rivers. Recent studies by the United Nations show that this loss of water supply is putting a great pressure on the African population.

　　In the 1960s, Lake Chad was nearly 83,200 square feet large. In about forty years, it has lost 95% of its size and it has almost completely dried up. At one time, it was one of the largest lakes in the world, and was around 960,000 square feet around 6,000 years ago.

　　The sizes of lakes and rivers and the amount of water have something to do with seasons naturally. But, pollution and agriculture also play an important part in the loss of water. Many pollutants (污染物) are put into lakes and rivers so that many lakes and rivers are seriously polluted, and the water may be poisonous (有毒的). If something isn’t done soon about the disappearing lakes and rivers, there will not be enough water for everyone. Then many people in Africa will face diseases and possible dehydration (脱水).

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