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单选题
How much of the solar radiation can be converted into usable energy?
A
5％-10％.
B
10％-15％.
C
30％-45％.
D
40％-55％.
参考答案
参考解析
解析：
录音中指出太阳能的使用的第一个问题是“the cells convert only 10％-15％of the radiation from the sun into energy”，由此可见只有10%到15%的太阳辐射可以被转化为可利用的能源，因此选B。
录音中指出太阳能的使用的第一个问题是“the cells convert only 10％-15％of the radiation from the sun into energy”，由此可见只有10%到15%的太阳辐射可以被转化为可利用的能源，因此选B。
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选出不是顾客讨价的句子：（ ）。A、Could you come down a bit?B、I can give you no more then 30 dollars. Can you sell it for that?C、How much is the large size?D、That sounds reasonable. But could you give me a 10% discount?
考题
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Solar power is cleaner than fossil fuels, and it involves less geopolitical risk.B
In most of the northern hemisphere, it can be expected that more than 150 days a year will be cloudy.C
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Consumers accustomed to the rapid acceleration of gasoline-powered cars will not accept the weak acceleration of solar-powered cars.
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12%～15%30%～40%40%～50%B
10%～15%25%～30%50%～60%C
10%～15%25%～35%45%～55%D
10%～15%30%～40%40%～50%E
15%～25%25%～35%45%～55%
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solar energy is renewable
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