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听力原文:One of the main complaints of city residents, not surprisingly, is the lack of pa

听力原文: One of the main complaints of city residents, not surprisingly, is the lack of parking. This problem is partly caused by all the abandoned cars on the streets. It has been estimated by A to Z Towing, Inc., a nationwide tow-truck agency, that over one million cars are abandoned on the streets and alleyways of the nation's cities. Each year approximately a third of those cars are moved and destroyed. The rest of the cars which are not removed take up parking spaces and make neighborhoods look rundown.

A survey of twenty cities by A to Z reports that as much as 30 million dollars is spent annually to tow away and dismantle abandoned vehicles. One city alone, Los Angeles, spends five million dollars a year to control the accumulation of abandoned cars on its streets. Even though the city spends so much money on the program, it is always fighting a losing battle as more and more cars are constantly coming off the production line.

Boston, on the other hand, which spends most of its money on museums and libraries, does not appropriate tax money to clean abandoned cars off the streets. In Boston the problem has been dealt with by a non-profit governmental agency called Street Horizons, which uses the money from the recycling of the metal in the cars to pay for the cost of towing them The program in Boston sounds good although it has not completely reached financial independence from the federal government yet. Until a truly self-sufficient program for removing old cars is developed, it will remain a serious problem

(33)

A.Around four hundred thousand cars.

B.Thirty million old cars.

C.One million junked cars.

D.Five million cars altogether.

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第1题

降钙素的主要生理功能A.促进钙磷经肠道吸收作用增强 B.抑制肾曲小管对麟的吸收,增进对钙的重吸收

降钙素的主要生理功能

A.促进钙磷经肠道吸收作用增强

B.抑制肾曲小管对麟的吸收,增进对钙的重吸收

C.抑制骨盐溶解,使血清钙含量降低

D.使7-脱氢胆固醇变为胆骨化醇

E.促进胆骨化醇转化为25-羟胆骨化醇

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第2题

降钙素的主要生理功能A.促进钙磷经肠道吸收作用增强 B.抑制肾曲小管对麟的吸收,增进对钙的重吸收

降钙素的主要生理功能

A.促进钙磷经肠道吸收作用增强

B.抑制肾曲小管对麟的吸收,增进对钙的重吸收

C.抑制骨盐溶解,使血清钙含量降低

D.使7-脱氢胆固醇变为胆骨化醇

E.促进胆骨化醇转化为25-羟胆骨化醇

点击查看答案

第3题

1,25-(OH)2D3生理功能是A.促进钙磷经肠道吸收作用增强 B.抑制肾曲小管对麟的吸收,增进对钙的重吸

1,25-(OH)2D3生理功能是

A.促进钙磷经肠道吸收作用增强

B.抑制肾曲小管对麟的吸收,增进对钙的重吸收

C.抑制骨盐溶解,使血清钙含量降低

D.使7-脱氢胆固醇变为胆骨化醇

E.促进胆骨化醇转化为25-羟胆骨化醇

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第4题

1,25-(OH)2D3生理功能是A.促进钙磷经肠道吸收作用增强 B.抑制肾曲小管对麟的吸收,增进对钙的重吸

1,25-(OH)2D3生理功能是

A.促进钙磷经肠道吸收作用增强

B.抑制肾曲小管对麟的吸收,增进对钙的重吸收

C.抑制骨盐溶解,使血清钙含量降低

D.使7-脱氢胆固醇变为胆骨化醇

E.促进胆骨化醇转化为25-羟胆骨化醇

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第5题

甲状旁腺素(PTH)具有的作用()

A.影响肠道对磷的吸收

B. 增强远曲小管对钙的重吸收

C. 抑制近曲小管对磷的重吸收

D. 促进小肠中钙的吸收

E. 动员骨钙释放入血

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第6题

甲状旁腺素的生理功能是

A.促进钙磷在小肠的吸收

B.促进旧骨脱钙,但不能使新骨钙化

C.抑制骨盐的溶解

D.抑制肾近曲小管对磷的重吸收,促进对钙的重吸收

E.促进肾近曲小管对钙的重吸收

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第7题

1,25-(OH)2D3与甲状旁腺素共同具有的生理功能是:( )

A.促进小肠对钙磷的吸收

B.促进旧骨脱钙,使新骨钙化

C.促进肾小管对钙磷的重吸收

D.抑制肾近曲小管对磷的重吸收

E.促进肾近曲小管对磷的重吸收

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第8题

关于维生素D的生理功能,哪项不正确A.促进小肠黏膜对钙磷的吸收B.促进肾近曲小管对钙磷的吸收C.促

关于维生素D的生理功能,哪项不正确

A.促进小肠黏膜对钙磷的吸收

B.促进肾近曲小管对钙磷的吸收

C.促进破骨细胞形成

D.抑制旧骨吸收

E.促进骨盐沉积于成骨细胞周围,利于新骨形成

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第9题

关于甲状旁腺激素作用的叙述错误的是A.促进骨钙入血B.促进肾远球小管对钙的重吸收C.促进肾近球小

关于甲状旁腺激素作用的叙述错误的是

A.促进骨钙入血

B.促进肾远球小管对钙的重吸收

C.促进肾近球小管对磷的重吸收

D.促进1,25-(OH)2-D3的生成

E.间接影响肠对钙、磷的吸收

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