A．Stockholm.

　　B．Barcelona.

　　C．Dubai.

　　D．UK.

　　答案　D　[由第四段第一句可知选D。]

　　B

　　The concept of solar power satellites，or SPS，first put forward in the 1960s，is still not widely known by the general public.For example at many public exhibitions about Energy，SPS is not even mentioned.This is mainly because very little funding has been spent on SPS research

　　to date—about 1/1000 of 1% of the approximately US $1 trillion that governments have spent subsidizing(补助)the development of nuclear power over the past 50 years.

　　There are critics who claim that SPS is unrealistic—because launch costs are much too high today；or because microwave beams will set fire to cities；or because it's too futuristic(未来的)．So why do we believe that it is important to continue to do research on SPS？The reason is very simple.

　　Humans are going to need enormous amounts of electric power in coming decades.Within 50 years the world population is expected to double，while economic growth will continue around the world，especially in the poorer countries.But existing energy sources already face serious problems.They're limited；they're polluting；they're dangerous.So 50 years from now,100 years from now，where is our power going to come from？Nobody knows.And so we believe that new large­scale possibilities should be studied further.

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