懂你英语L3U3P1-中英文精编版..docVIP

??????????????????????? 必威体育精装版 料推荐 ??????????????????? Level 3 ·Unit 3 Part·1 Listening Life Conditions 1 There are many forms of life on Earth, including human beings. 地球上有多种形式的生命，包括人类。 Life exists in a variety of conditions.生命存在于各种各样的环境中。 Some forms of life live in a watery environment, like the oceans. 有些生物生活在水环境中，比如海洋。 Other forms of life can be found in very dry areas like deserts. 在非常干燥的地区，如沙漠，也可以找到其他形式的生命。 However, for any form of life to exist, conditions must be right. 然而，任何形式的生命存在，条件必须是正确的。 When conditions are not right, that form of life will become extinct. 当情况不佳时，这种形式的生命就会灭绝。 To become extinct means to die out completely. 灭绝意味着完全灭绝。 Conditions must be right for life to exist. 环境必须是生命存在的权利。 Millions of years ago there were forms of life that no longer exist. 数百万年前，有些生命形式已经不复存在。 When conditions changed, these forms of life died out. 1 ??????????????????????? 必威体育精装版 料推荐 ??????????????????? 当条件改变时，这些形式的生命就消失了。 One extinction event happened about 250 million years ago. 一次灭绝事件发生在大约 2.5 亿年前。 This was the largest extinction event of all time. 这是有史以来最大的一次物种灭绝事件。 Many forms of life became extinct. 许多形式的生命都灭绝了。 Ninety six percent of all life in the oceans died out. 海洋中 96%的生命都灭绝了。 Most insects also became extinct大.多数昆虫也灭绝了。 This event happened over a period of several million years. 这件事发生在几百万年的时间里。 The causes of this extinction event are still unknown. 这种灭绝事件的原因尚不清楚。 Possible causes include large volcanic eruptions and global warming. 可能的原因包括大规模的火山爆发和全球变暖。 Some scientists believe that there were several causes. 一些科学家认为有几个原因。 They believe that a series of events caused the extinctions. 他们认为一系列事件导致了物种灭绝。 Scientists are working to better understand what really happened. 科学家们正在努力更好地了解到底发生了什么。 2 ??????????????????????? 必威体育精装版 料推荐 ??????????????????? Listening Life Conditions 2 In modern times we humans face changing conditions. 在现代，我们人类面临着不断变化的环境。 For humans to live, we need clean air and clean water. 为了人类生存，我们需要干净的空气和清洁的水。 Pollution is now a growing problem around the world. 在世