Italian experts are proposing a dramatic new solution to the watery threat facing the city of Venice. Rather than battling to keep the sea out—they want to use it to help raise the sinking island-city.
(33) The scheme would~ involve pumping huge quantities of sea water into the ground beneath Venice down 12 pipes each of which would be 700m long. The sea water would make the sand beneath the city expand lifting Venice by 30cra in 10 years.
(34)Now, a panel of engineers and geologists from the respected University of Padua have come up with the new scheme costing just a fraction of that—100m euro.
It says the plan would help raise Venice by almost as much as it has sunk over the past three centuries. The professor leading the project says it is not an alternative to the floodgates - but would work in collaboration with them. Be now wants to carry out a trial to see if the theory would work in practice.
Not everyone is convinced. (35) One expert—who helped stabilize the leaning Tower of Pisa—described the scheme as pure science fiction and warned it could damage the fragile structure of Venice. But the city's mayor is interested. He says it is time to look again at how to raise the city—and is convinced that the technology exists to make it a reality.
(33)
A.Building floodgates to keep the sea out.
B.Stopping the sea level rising.
C.Raising the sinking city of Venice.
D.Saving the city from flooding.
第1题
A.补体大多为糖蛋白,属于球蛋白
B.正常血清中补体各组分含量相差较大,其中C含量最高
C.补体的性质不稳定,易受各种理化因素的影响
D.补体在56℃加热30分钟能灭活
E.补体蛋白通常以活化蛋白前体存在于体液中
第2题
A.补体大多为糖蛋白,属于β球蛋白
B. 正常血清中补体各组分含量相差较大,其中C含量最高
C. 补体的性质不稳定,易受各种理化因素的影响
D. 补体在56℃加热30分钟能灭活
E. 补体蛋白通常以活化蛋白前体存在于体液中
第3题
A.补体大多为糖蛋白,属于β球蛋白
B. 正常血清中补体各组分含量相差较大,其中C4含量最高
C. 补体的性质不稳定,易受各种理化因素的影响
D. 补体在56℃加热30分钟能灭活
E. 补体蛋白通常以活化蛋白前体存在于体液中
第4题
A.补体成分大多数是以非活性的酶前体存在于血清中
B.补体系统的激活具有放大效应
C.补体性质不稳定,经56℃30分钟处理即可灭活
D.在非特异性和特异性免疫中发挥作用
E.以上各项叙述均有错误
第5题
关于补体的叙述,不正确的是()。
A、其作用是非特异的
B、存在于正常人或动物血清中的一组不耐热的蛋白质
C、其性质很不稳定
D、具有酶活性的蛋白质
E、补体在血清中含量随免疫原刺激而增高
第6题
下列关于补体的说法正确的是
A、存在于血清中的不耐热成分
B、巨噬细胞是主要的产生细胞
C、参与抗感染、免疫调节和免疫损伤的作用
D、人类在胚胎发育期就可以合成
E、以上都是
第7题
关于补体系统的叙述,下列不正确的是()。
A.补体成分大多数是以非活性的酶前体存在于血清中
B.补体系统的激活具有放大效应
C.补体性质不稳定,经56℃30分钟处理即可灭活
D.在非特异性和特异性免疫中发挥作用
E.以上各项叙述均有错误
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