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第六部分：完形填空
閱讀下面的短文，文中有15處空白，每處空白給出了4個選項，請根據短文的內容從4個選項中選擇1個最佳答案。
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 （點燃) 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 Collage 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 （自發(fā)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 Joomal of Acoal 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 （釋放) . One suggested ______ （64) of containing the fires was presented by Gary Colaizzi， of the engineering firm Goodson， which has developed a heat-resistant grout （灌漿)，which is designed to be pumped into the coal fire to ______ （65) the oxygen supply.
51. A. house B. underground C. sky D. water
52. A. only B. even C. just D. then
53. A. release B. paste C. consumption D. elimination
54. A. happily B. traditionally C. surprisingly D. fashionably
55. A. exchange B. regenerate C. disappear D. transfer
56. A. Most B. Such C. Some D. Many
57. A. comparison B. case C. time D. turn
58. A. which B. who C. whose D. what
59. A. Yet B. Unless C. Although D. Once
60. A. data B. volumes C. figures D. images
61. A. attack B. impact C. identification D. implication
62. A. develop B. relieve C. detect D. supply
63. A. estimate B. experiment C. gather D. illustrate
64. A. cause B. method C. treatment D. rule
65. A. take up B. back up C. run out D. cut off
答案：
51-55：BBACC
56-60：BACDB
61-65：BCABD
