A．benefit the government

　　B．draw more home buyers

　　C．help the housing industry develop soundly

　　D．affect the sound development of the Chinese society

　　53．Collecting taxes on houses has all the following effects except________.

　　A．making the developers do their best to sell their houses

　　B．cutting down speculations

　　C．supplying a stable tax resource for the government

　　D．decreasing the sales cost

　　C

　　For the people living in the Nile Basin，the river is their life.This 6,825 km waterway，whose watershed (流域) covers three million square kilometers，flows through mountains，woodlands，lakes and deserts.Its potential for fishing，tourism and shipping is great—but so are its challenges.

　　Water shortage，already serious in Egypt and Sudan，will soon influence several other countries in the watershed as well.Today，about 160 million people depend on the Nile River for their living.Within the next 25 years，the district’s population is expected to double，adding to the demand brought about by growth in industry and agriculture.The frequent drought (干旱) adds to the urgency.

　　Water quality is also a problem.Precious soil is washed out to sea.Wastes from industry and agriculture create pollution.Higher concentrations of salt influence irrigated soils.Water-borne diseases continue unchecked.In areas where it’s hot and damp，water hyacinths choke off lakes，dams and other sections of the river，making it difficult for fishing and other businesses to move forward.

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