导航 5.frequently ady频繁地；经常 ad频繁的；经常的 6.restrict vt.限制；限定；束缚 n.限制规定；限制法规；约束
导航 5.frequently adv.频繁地;经常 → frequent adj.频繁的;经常的 6.restrict vt.限制;限定;束缚 → restriction n.限制规定;限制法规;约束
导航 重点短语 1. dioxide二氧化碳 2.fossil 化石燃料（如煤或石油） 3.have a(n)... 0…对.有.…影响；对.…产 生.…影响 4.result 造成；导致 5.consider ,sth考虑做某事
导航 重点短语 1. carbon dioxide 二氧化碳 2.fossil fuel 化石燃料(如煤或石油) 3.have a(n)... impact on... 对……有……影响;对……产 生……影响 4.result in 造成;导致 5.consider doing sth 考虑做某事
导 阅读自测 Step 1 Fast Reading 一、快速浏览课文，将段落与其主旨大意相匹配 I.Paragraph 1- A.It is a fact that Earth is getting warmer and warmer. 2.Paragraph 2 B.The rise in temperature has brought great harm. 3.Paragraph 3 C.What should be done to reduce greenhouse gas emissions. 4.Paragraph 4 D.The "man-made"greenhouse effect is responsible for the rise in temperature. 5.Paragraph 5 E.The photo of a dead polar bear showed the impact of the rise in temperature on Earth's ecology
导航 阅 读 自 测 Step 1 Fast Reading 一、快速浏览课文,将段落与其主旨大意相匹配 1.Paragraph 1 A.It is a fact that Earth is getting warmer and warmer. 2.Paragraph 2 B.The rise in temperature has brought great harm. 3.Paragraph 3 C.What should be done to reduce greenhouse gas emissions. 4.Paragraph 4 D.The “man-made” greenhouse effect is responsible for the rise in temperature. 5.Paragraph 5 E.The photo of a dead polar bear showed the impact of the rise in temperature on Earth' s ecology
导航 Step 2 Detailed Reading 二、仔细阅读课文，选择最佳答案 1.Why were the remains of the dead polar bear only "skin and bones'”? .It died of starvation. B.It died many years ago. C.Seals had eaten up its meat. D.The high temperature had rotten it
导航 Step 2 Detailed Reading 二、仔细阅读课文,选择最佳答案 1.Why were the remains of the dead polar bear only “skin and bones”? A.It died of starvation. B.It died many years ago. C.Seals had eaten up its meat. D.The high temperature had rotten it. √
导航 2.What causes Earth's surface temperature to rise quickly? A.The warming ocean. .The“man-made”greenhouse effect.. C.The rising sea levels. D.The“natural'”greenhouse effect
导航 2.What causes Earth' s surface temperature to rise quickly? A.The warming ocean. B.The “man-made” greenhouse effect. C.The rising sea levels. D.The “natural” greenhouse effect. √