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  3. Underground Coal Fires Coal burning deep underground in China, India and Ind...

Underground Coal Fires Coal burning deep underground in China, India and Ind...

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问题 Underground Coal Fires
Coal burning deep underground in China, India and Indonesia is threatening the environment and human life, scientists have warned. These large scale___________ (51)blazes （火焰）cause the ground temperature to heat up and kill surrounding vegetation,produce greenhouse gases and can___________ (52) ignite （点燃）forest fires，a group of scientists told the annual meeting of the American Association for the Advancement of Science in Denver. The resulting___________ (53) of poisonous elements like mercury can also pollute local water sources and soils, they warned.
“Coal fires are a global disaster,” said Associate Professor Glenn Stracher of East Georgia College in Swainsboro, USA. But____________ (54) few people know about them.
Coal can heat up on its own, and eventually catch fire and burn, if there is a continuous oxygen supply. The heat produced is not caused to___________ (55) and, under the right combinations of sunlight and oxygen，can trigger spontaneous （自发的）catching fire and burning. This can occur underground，in coal stockpiles，abandoned mines or even as coal is transported. ___________ (56) fires in China consume up to 200 million tons of coal per year, delegates were told. In___________ (57)，the U. S.economy consumes about one billion tons of coal annually, said Stracher,____________ (58) analysis of the likely impact of coal fires has been accepted for publication in the International Journal of Coal Ecology .____________ (59) underway, coal fires can burn for decades, even centuries. In the process，they release large___________ (60) of greenhouse gases, poisonous fumes and black particles into the atmosphere.
The members of the panel discussed the____________ (61) these fires may be having on global and regional climate change, and agreed that the underground nature of the fires makes them difficult to___________ (62).
Ultimately, the remote sensing and other techniques should allow scientists to___________ (63) how much carbon dioxide these fires are emitting （释放）.One suggested___________ (64) of containing the fires was presented by Gary Colaizzi, of the engineering firm Goodson，which has developed a heat-resistant grout （灌浆），which is designed to be pumped into the coal fire to____________ (65) the oxygen supply.
选项 A Yet
B Once
C Unless
Dlthough
答案B
解析选项B的意思是“一旦（发生）”，符合句意要求。其他选项，yet的意思是“仍旧”，unless的意思是“除非”，although的意思是“尽管”。
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