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Coal burning deep underground in China,India and Indonesia is threatening the environment and human life, scientists have warned. These large-scale underground fires cause the ground temperature to heat up and kill surrounding vegetation, produce greenhouse gases and can even bring about forest fires, a panel(专门小组)of scientists told the annual meeting of the American Association for the Advancement of Science in Denver. They warned the resulting release of poisonous elements like arsenic (砷)and mercury(汞)can also pollute local water sources and soils “Coal fires are a global disaster,” said Associate Professor Glenn Stracher of East Georgia College in Swainsboro, U.S.A. But surprisingly 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 disappear and under the right combinations of sunlight and oxygen, can trigger spontaneous(自然产生的)catching fire and burning. This can occur underground in coal stockpiles(煤堆), abandoned mines or even as coal is transported. Such fires in China destroy up to 200 million tons of coal per year, delegates were told. In comparison, the U. S. economy consumes about one billion tons of coal annually, said Stracher, whose analysis of the likely effect of coal fires has been accepted for publication in the International journal of Coal Ecology. Once underway, coal fires can burn for decades, even centuries. In the process, they release large volumes of greenhouse gases, poisonous fumes and black particles into the atmosphere.

The members of the panel discussed the effect these fires may be having on global and regional climate change, and agreed that the underground nature of the fires makes them difficult to detect(发现). One of the members of the panel, Assistant Professor Paul Van Dijk of the International Institute for Geo-Information Science and Earth Observation in the Netherlands, has been working with the Chinese government to detect and monitor fires in the northern regions of the country.

The remote sensing and other techniques will allow scientists to estimate how much carbon dioxide these fires are emitting. One suggested method of controlling the fires was presented by Gary Colaizzi, of the engineering firm Goodson, which has developed a beat-resistant grout designed to be pumped into the coal fire to cut off the oxygen supply.

1.According to Paragraph 2, what will happen when the underground heat does not disappear? ________.

A.Coal heats up on its own and catches fire and burns.

B.The underground oxygen will be used up.

C.Poisonous fumes and greenhouse gases will be accumulated underground.

D.There will be an increase of abandoned mines.

2.What did Stracher analyze in his article published in the International Journal of Coal Ecology? ________.

A.Annual consumption of coal in US.

B.Annual consumption of coal in China.

C.How long coal fires have lasted in the northern region of China.

D.Coal fires may have an effect on the environment.

3.Which of the following statements about Paul Van Dijk is NOT true? ________.

A.He was one of the scientists who have warned against the threats of underground fires.

B.He has detected and monitored underground fires in the Netherlands.

C.He has worked with the Chinese government on the underground fires issue.

D.He works for a research institute in the Netherlands.

4.What is the suggested method to control underground fires in the passage? ________.

A.Using remote sensing technique.

B.Controlling the release of carbon dioxide.

C.Cutting off the oxygen supply.

D.Making the soil heat resistant.

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