共用题干 California Gives Green Light to Space Solar PowerEnergy beamed down fro...

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问题共用题干 California Gives Green Light to Space Solar Power

Energy beamed down from space is one step closer to reality,now that California has given the green
light to an agreement that would see the Pacific Gas and Electric Company buy 200 megawatts（兆瓦）of power
beamed down from solar-power satellites beginning in 2016.But some major challenges will have to be
overcome if the technology is to be used widely.
A start-up company called Solaren is designing the satellites,which it says will use radio waves to beam
energy down to a receiving station on Earth.
The attraction of collecting solar power in space is the almost uninterrupted sunshine available in geo-
synchronous（与地球同步的）orbit. Earth-based solar cells , by contrast , can only collect sun light during day-
time and when skies are clear.
But space-based solar power must grapple（努力克服）with the high cost per kilogram of launching things in-
to space,says Richard Schwartz of Purdue University in West Lafayette,Indiana."if you're talking about it being
economically viable for power of the Earth,it's a tough go,"he says.
Cal Boerman,Solaren's director of energy services,says the company designed its satellites with a view
to keeping launch costs down."We knew we had to come up with a different,revolutionary design,"he says.
A patent the company has won describes ways to reduce the system's weight,including using inflatable mir-
rors to focus sunlight on solar cells,so a smaller number can collect the same amount of energy.
But using mirrors introduces other challenges,including keeping the solar cells from overheating,says
Schwartz."You have to take care of heat dissipation（散发）because you're now concentrating a lot of energy
in one place,"he says.According to the company's patent,Solaren's solar cells will be connected to radia-
tors to help keep them cool.
Though Boerman says the company believes it can make space-based solar power work,it is not expec-
ting to crowd out other forms of renewable energy.Laws in California and other states require increasing use
of renewable energy in coming years,he points out."To meet those needs,we're going to need all types of
renewable energy sources,"he says.

选项 Space-based solar cells could collect solar power only when skies are clear. A:Right B:Wrong C:Not mentioned

答案 B

解析根据短文第二段可知，太阳能卫星会使用无线电波将能源发送到地球上的接收站。
短文在第一段中讲太平洋天然气和电力公司将购买200兆瓦的从太阳能电站的卫星上发送来的电力时提到了200这个数字。
短文在第三段末尾提到：地球上的太阳能电池只能在白天且无云的时候收集阳光。
根据短文第四段可知，在太空的太阳能工厂必须努力克服的问题是：向太空每发射一千克的物品都要付出高昂代价，即成本高的问题。
根据短文第五段的最后一句可知答案。
根据短文最后一段可知，从太空中获得的太阳能并不会挤掉其他形式的可再生能源。
短文主要围绕美国，尤其是加州来说，并没有提到其他国家的情况。

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