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我的练习
1.标出123即红花
2.标出绿叶
3.标出框子
4.朗读并翻译
5.用自己的语言复述
6.摘串
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The Cretaceous-Tertiary （白垩纪，第三记）extinction（灭绝） event, or the K-T event, is the name given to the die-off of the dinosaurs and other species（物种） that took place some 65.5 million years ago. For many years, paleontologists（古生物学者） believed this event was caused by climate and geological（地质学） changes that interrupted the dinosaurs’ food supply. However, in the 1980s, father-and-son scientists Luis (1911-88) and Walter Alvarez (1940-) discovered in the geological record a distinct layer of iridium–an element found in abundance（大量的） only in space–that corresponds to the precise（明确的） time the dinosaurs died. This suggests that a comet, asteroid（小行星） or meteor（流星） impact event may have caused the extinction of the dinosaurs. In the 1990s,scientists located the massive （巨大的）Chicxulub Crater（希克苏鲁伯陨石坑） at the tip of Mexico’s Yucatán Peninsula（墨西哥尤卡坦半岛）, which dates to the period in question.
摘串
1.the K-T event took place 65.5million years ago.
2.the name given to the die-off of the dinosaurs and other species.
3.climate and geological（地质学） changes interrupted the dinosaurs’ food supply.
4.corresponds to the precise（明确的） time the dinosaurs died.
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