2013年职称英语考试理工类A级真题及参考答案

　　第6部分：完形填空(第51-65题，每题1分，共15分)

　　下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。

Better Solar Energy Systems: More Heat, More Light

　　Solar photovoltaic(光电的) thermal energy systems, or PVTs, generate both heat and electricity, but ________ (51)now they haven’t been very good at the heat-generating part compared to a stand-alone solar thermal collector .That’s because they operate at low temperatures to cool crystalline silicon(晶体硅) solar cells, ________ (52)lets the silicon generate more electricity but isn’t a very efficient way to gather heat.

　　That’s a problem of economics. Good solarhot-water systems can harvest much more energy than a solar-electric system at a substantially lower __________(53) .And it’s also a space problem: photovoltaic cells can __________(54)up all thespace on the roof, leaving little room for thermal applications.

　　In a pair of studies, Joshua Pearce, an associate professor of materials science and engineering, has devised a __________(55) in the form of a better PVT made with a different kind of silicon.

　　Most solar panels are made with crystalline silicon, but you can also make solar cells out of amorphous(非晶形的) silicon, commonly known as thin-film silicon. They don’t create as much electricity, but they are lighter, flexible, and cheaper. And, because they __________ (57) much less silicon, they have a greener footprint. __________ (58), thin-film silicon solar cells are vulnerable to some bad-news physics in the form of the Staebler-Wronski effect.

　　“That means that their efficiency drops when you__________ (59) them to light — pretty much the worst possible effect for a solar cell,” Pearce explains, which is one of the __________ (60) thin- film solar panels make up only a small fraction of the market.

　　However, Pearce and his team found a __________ (61) to engineer around the Staebler-Wronski effect by incorporating thin-film silicon in a new _____ (62) _____ of PVT .You don’t have to cool down thin-film silicon to make it work. In fact, Pearce’s group discovered that by heating it to solar-thermal operating temperatures, near the boiling __________ (63) of water, they could make thicker cells that largely _________ (64) the Staebler-Wronski effect. When they applied the thin-film silicon directly to a solar thermal energy collector, they also found that by baking the cell once a day, they__________(65) the solar cell’s electrical efficiency by over 10 percent.

　　A51. A. until B. unless C. when D. if

　　B52. A. what B. which C. that D. who

　　D53. A. reward B. bill C. pay D. cost

　　D54. A. move B. set C. live D. take

　　C55. A. decision B. suggestion C. solution D. qualification

　　D56. A. for B. by C. with D. as

　　C57. A. retrieve B. merge C. require D. exchange

　　A58. A. UnfortunatelyB. Certainly C. Luckily D. Immediately

　　D59. A. cover B. relate C. face D. expose

　　C60. A. restrictions B. advances C. reasons D. strengths

　　D61. A. part B. result C. subject D. way

　　A62. A. type B. size C. shape D. brand

　　B63. A. area B. point C. place D. extent

　　C64. A. promoted B. improved C. overcame D. asserted

　　A65. A. boosted B. defined C. wasted D. lower

　　参考答案：ABDDC DCADC DABCA