Polarbearsaresufferingina 46 (warm)worldthaneverbefore...
問題詳情:
Polar bears are suffering in a 46 (warm) world than ever before.
Polar bears live in environments too cold for most animals. 47 much of the year, they live and hunt on the frozen Arctic sea ice. Nature has prepared 48 for the cold conditions. But nothing has prepared the bears 49 the danger that threatens the only home they know.
The polar bears’ world is melting. Studies show that the polar ice has reduced by 9.8% every 10 years 50 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their 51 (survive). “The sea ice is more than just this platform that the bears walk over,” says Andrew Derocher, 52 scientist who studies North American polar bear populations. “ 53 it, they can’t exist.”
Some melting and refreezing of the polar ice is natural. 54 in a warmer world, these cycles speed up, and bears have less time to hunt. Normally, they have three months in the spring when they gain more weight. The extra fat is used later, 55 the bears are not actively hunting.
【回答】
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知識點:語法填空
題型:未分類
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下列各組詞語中,沒有錯別字的一組是A.閒情逸致 聲名鵲起 意氣相投 金碧輝煌B.情隨事遷 隱約...
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Chinahasbeenpushingthereformofpublichospitals_______al...
問題詳情: Chinahasbeenpushingthereformofpublichospitals_______allitscitizens.A.inchargeof B.forthepurposeof C.inhonorof ...
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閱讀下面的文言文,完成1—4題。陳宗禮,字立之。少貧力學,袁甫為*東提點刑獄,宗禮往問學焉。淳祜四年,舉進士。...
問題詳情:閱讀下面的文言文,完成1—4題。陳宗禮,字立之。少貧力學,袁甫為*東提點刑獄,宗禮往問學焉。淳祜四年,舉進士。調邵武*判官,入為國子正,遷太學博士、國子監丞,轉祕書省著作佐郎.入對,言火不循軌①。帝以星變為憂,宗禮曰:“上天示戒,在陛下修德佈政以迴天意。”又曰:“...
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下列離子方程式的書寫正確的是( )A.過量C02通入*氧化鈣溶液中:CO2+OH﹣═HCO3﹣B.Na202...
問題詳情:下列離子方程式的書寫正確的是()A.過量C02通入*氧化鈣溶液中:CO2+OH﹣═HCO3﹣B.Na202加入H2180中:2Na2O2+2H218O═4Na++4OH﹣+18O2↑C.矽與***的反應:Si+4H++4F﹣═SiF4↑+2H2↑D.水玻璃中通人過量二氧化碳:Na2SiO3+CO2+H2O═2Na++CO32﹣+H2SiO3【回答】【考點】離子方程...
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