题目

阅读理解     A new study shows that the increased heat from Arctic (北极的)rivers is making sea ice in the Arctic Ocean gradually disappear. The study published this week in Science Advance was led by the Japan Agency for Marine-Earth Science and Technology, together with other scientists in the United States, United Arab Emi rates, Finland and Canada.     According to the research, the main Arctic rivers bring more heat to the Arctic Ocean than they did in 1980. River heat is one of the reasons that cause sea ice loss of the Arctic Ocean. That loss is equal to about 120,000 square miles of 1-mcter thick ice. "If Alaska were covered by 1-meter thick icc. 20% of Alaska would be gone," explained Igor Polyakov, a re- searcher at the University of Alaska Fairbanks' International Arctic Research Center.     Rivers have the greatest influence during spring. The wanning water pours into the ice covered Arctic Ocean and spreads below the ice, slowly destroying it. Once the sea ice melts(融化), the warm water makes the temperature go up. The research found that much more river heat energy entered the air. Since air is mobile, this means river heat can influence areas of the Arctic far from river deltas (三角洲).     The influence was the most prominent in the Siberian Arctic, where several large rivers go into the Arctic Ocean. Canada's Mackenzie River is the only river large enough to contribute to sea ice meh near Alaska, but the state's smaller rivers are also a source of heat.     Polyakov says that rising global air temperatures will continue to warm Arctic rivers in the future. As rivers heat up, more warm water will flow into the Arctic Ocean, melting more sea ice. （1） What does the increased heat from Arctic rivers cause? A . Dry weather in the Arctic. B . A strange disease in the Arctic. C . The gradual loss of sea ice in the Arctic Ocean. D . The death of fish in the Arctic Ocean. （2） What can we learn from paragraph 2? A . Alaska will disappear. B . There's more and more sea ice in the Arctic Ocean. C . 10% of sea ice in the Arctic Ocean melts each day. D . Arctic rivers bring more heat to the Arctic Ocean. （3） What does the underlined word "prominent" in paragraph 4 mean? A . Obvious. B . Important. C . Famous. D . Generous. （4） What is the best title for the text? A . Arctic Rivers Will Disappear B . Arctic Rivers Are Melting Arctic Sea Ice C . Arctic Rivers Will Create a New River Delta D . Arctic Rivers Bring More Sea Animals to the Arctic Ocean 答案： C D A B

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