首先奉上今天的词汇题: monumental=enormous warning=indication retard=slow congestion=over crowded subsistence=survival manipulate=skillfully used pursue=practice alter=transform abundant=plentiful sustain=support emit=release expose=unprotected 第一篇 生命的形成 原文回顾:地球早期火山爆发使得地球上有很多大气,后来形成了一些简单的植物。这些 植物吸收了甲烷和二氧化碳进行光合作用,光合作用产生了氧气和水(于是就有了海),一些简单生物就在海里形成了。氧气多了以后形成了一个氧气保护膜,使得地球气温不太高,生物不受紫外线伤害。太阳系上其他行星因为没有这个氧气保护层,所以没有办法形成生命。 解析:生物进化类的文章,单词已经不陌生了,句子结构也比较清楚,是容易出分的文章。 相关背景学习: Timeline of evolutionary history of life This timeline of evolution of life represents the current scientific theory outlining the major events during the development of life on planet Earth. In biology, evolution is any change across successive generations in the heritable characteristics of biological populations. Evolutionary processes give rise to diversity at every level of biological organization, from kingdoms to species, and individual organisms and molecules, such as DNA and proteins. The similarities between all present day organisms indicate the presence of a common ancestor from which all known species, living and extinct, have diverged through the process of evolution. Although more than 99 percent of all species that ever lived on the planet are estimated to be extinct, there are currently 10–14 million species of life on the Earth.