D. It was bees that caused the deaths of bats.
38. The word pipistrelle in Paragraph 1 refers to
A. a kind of fungus.
B. an area in the U.S.
C. a special cave.
D. a kind of bat.
39. The moths in Paragraph 3 are taken as an example of
A. diseases that kill bats.
B. Insects that bats eat.
C. animals that have diseases.
D. bat species that are starving to death.
40. What is the purpose of the last paragraph?
A. To get people to stop killing bats.
B. To hire workers for the Fish Wildlife Department.
C. To ask people not to touch dead bats.
D. To tell the public how to help bats.
第三篇 Better Solar Energy Systems: More Heat, More Light
Solar photovoltaic thermal energy systems, or PVTs, generate both heat and electricity, but until now they havent been very good at the heat-generating part compared to a stand-alone solar thermal collector. Thats because they operate at low temperatures to cool crystalline silicon solar cells, which lets the silicon generate more electricity but isnt a very efficient way to gather heat.
Thats a problem of economics. Good solar hot-water systems can harvest much more energy than a solar-electric system at a substantially lower cost. And its also a space problem: photovoltaic cells can take up all the space on the roof, leaving little room for thermal applications.
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