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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 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 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 solar hot-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 the space 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. His research collaborators are Kunal Girotra from ThinSilicon in California and Michael Pathak and Stephen Harrison from Queen’s University, Canada.
Most solar panels are made with crystalline silicon, but you can also make solar cells out of amorphous silicon, commonly known ____ (56) 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.
51．A．until B．unless C．when D．if
52．A．what B．which C．that D．who
53．A．reward B．bill C．pay D．cost
54．A．move B．set C．live D．take
55．A．decision B．suggestion C．solution D．qualification
56．A．for B．by C．with D．as
57．A．retrieve B．merge C．require D．exchange
58．A．Unfortunately B．Certainly C．Luckily D．Immediately
59．A．cover B．relate C．face D．expose
60．A．restrictions B．advances C．reasons D．strengths
61．A．part B．result C．subject D．way
62．A．type B．size C．shape D．brand
63．A．area B．point C．place D．extent
64．A．promoted B．improved C．overcame D．asserted
65．A．boosted B．defined C．wasted D．lower
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