根据第一段“Polar bear mothers invest a huge amount into their cubs (幼兽), isolating themselves in dens (兽穴) dug with great effort into piles of snow to provide care through the unforgiving conditions of Arctic winter. It’s little wonder that the bears are hesitant to leave when ...
He is now consulting on a project using radar technology to identify dens and ensure protection for the animals symbolic of the Arctic. (1) Why does the author mention polar bear mothers in paragraph 1? A . To attract sympathy for the polar bears. B . To condemn human activities that ...
Many studies point to a long-term decline in sea ice ( especially in the Arctic ), ice on land, and tiny pollutants called aerosols — all of which reflect sunlight back into space to cool Earth.With ice cover declining, Earth is absorbing more radiation. The extra radiation absorbed by ...
Animals in the sea.14. What does the underlined wordconstrained” in Paragraph 6 probablymean?AA. Limited.B. Counted.C. Increased.D. Concerned.15. What is the last paragraph mainlyabout?DA. The coldness of the Arctic.B. The effect of global warming.C. The importance of environment...
He is now consulting on a project using radar technology to identify dens and ensure protection for the animals symbolic of the Arctic.1. Why does the author mention polar bear mothers in paragraph 1? A.To attract sympathy for the polar bears. B.To condemn human activities that damage ...
be used to try to pick up a heat signature inside the den,it only works when conditions are perfect,and they rarely are in Arctic winter," says Larson.He is now consulting on a project using radar technology to identify dens and ensure protection for the animals symbolic of the Arctic.知...
极熊)阅读下面短文,从每题所给的 A、B、C和D四个选项中,选出最佳选项Polar bear mothers invest a huge amount into their cubs(幼兽), isolating themselves in dens(兽穴) dug with great effort into piles of snow to provide care through the unforgiving conditions of Arctic winter. It's little won...
Sea ice is crucial for polar predators(捕食性动物) such as penguins in Antarctica and polar bears in the Arctic,which use the ice as a platform for hunting.But the sea 'ice also helps stabilise ice on Antarctica."Lower sea ice extent means that ocean waves will pound the...
Effect of semi-concentrate rations on productivity and viability of animals in the Arctic regions. reserves and an indoor period of 250 to 280 days, rations for cows on a farm in the Murmansk region had concentrates 56, succulents 26 and roughage ... NF Kravenko - 《Zhivotnovodstvo》 被引...
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