[单项选择]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 geosynchronous(与地球同步的) orbit. Earth-based solar cells, by contrast, can only collect sunlight during daytime 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 into space, says Richard Schwartz of Purdue University in West Lafayette, Indiana, "If you’re talking abo
A. Right
B. Wrong
C. Not mentioned

[单项选择]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 geosynchronous(与地球同步的) orbit. Earth-based solar cells, by contrast, can only collect sunlight during daytime 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 into space, says Richard Schwartz of Purdue University in West Lafayette, Indiana, "If you’re talking abo
A. Right
B. Wrong
C. Not mentioned

[单项选择]Solar Power without Solar Cells 　　A dramatic and surprising magneticeffect of light discovered by University of Michigan1researcherscould lead to solar power without traditional semiconductor-based solar cells. 　　The researchers found a way to make an“optical 　51　,” said Stephen Rand, a professor in thedepartments of Electrical Engineering and Computer Science, Physics and AppliedPhysics. 　　Light has electric and magnetic 　52　.Until now, scientists thought the effect of the magnetic field were so weakthat they could be 　 53　. What Rand and his colleagues found isthat at the right intensity, when light is traveling through a material thatdoes not 　 54　electricity, the light field cangenerate magnetic effects that are 100 million times stronger than previouslyexpected. Under these circumstances, the magnetic effects develop strength 　55　toa strong electric effect. 　　“This could lead to a new kind of solarcell without semiconductors and without absorption to produce charge separation,
A. concerned
B. ignored
C. expected
D. noticed