Polarbearsaresufferingina 46 (warm)worldthaneverbefore...
问题详情:
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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知识点:语法填空
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问题详情:读下图,回答3—4题3.水循环中A.①环节是水汽输送,中纬西风是其主要动力B.②环节是降水,主要集中在春、秋季节C.③环节是地表径流,径流量季节和年际变化大D.④环节蒸发的水汽,大部分被输送到陆地上空4.关于图中*、乙、*、丁四处的叙述,正确的是A.*处为向斜山,主要由...
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阅读下面的文言文,完成1—4题。陈宗礼,字立之。少贫力学,袁甫为*东提点刑狱,宗礼往问学焉。淳祜四年,举进士。...
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下列句子中没有运用拟人修辞手法的一项是( ) A.我们的春雁每天都要去玉米地作一次旅行,但绝不是偷偷摸摸进行的...
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