Unit 1 Nature in the balance单元目标与话题引入（课件PPT）-【优化指导】2022-2023学年新教材高中英语必修第三册（译林版2020）

Unit 1　Nature in the balance 返回导航 英语　必修 第三册（Y） Unit 1　Nature in the balance 栏目索引 话题类文导入 话题类文导入 返回导航 英语　必修 第三册（Y） Unit 1　Nature in the balance 返回导航 英语　必修 第三册（Y） Unit 1　Nature in the balance 返回导航 英语　必修 第三册（Y） Unit 1　Nature in the balance 返回导航 英语　必修 第三册（Y） Unit 1　Nature in the balance 谢谢观看！ Only to obey nature in order to overcome nature. ——Charles Darwin, English naturalist 要征服自然只能遵从自然。 ——查尔斯·达尔文，英国博物学家 [学海淘金] 主题语境——人与自然。北极变暖导致北极熊数量急剧减少，呼吁人们关注全球变暖， 同时提高对濒危动物的保护意识。 More than two thirds of the world's polar bears will be wiped out① by 2050, according to a shocking new study.By then, scientists say, global warming will have melted② 42 per cent of the Arctic sea ice.By 2100, only a very few of these important creatures will be left. The report has been produced by the US Geological Survey.The scientists have publicized their findings in the hope of influencing US Interior Secretary Dirk Kempthorne, who has been asked to put polar bears on the US endangered species list③. Polar bears depend on floating sea ice as a platform for hunting seals, which are their main food.Without enough ice, polar bears would be forced to go onto the land, where they are poorly skilled hunters, and would be unlikely to adapt to the life on the land in time.Experts say few little bears would survive④ and the stress could make many females unable to get pregnant. The team of American and Canadian scientists spent six months studying bears on the ground, from spotter planes and in the lab, using computer models.Some team members fear the result is even worse for the bears than what their report says. [词海拾贝] ①wipe out灭绝 ②melt v. 融化 ③endangered species list濒危物种名单 ④survive vi.生存，存活vt.幸存，幸免于难 $