题型：语法填空（语篇） 题类：常考题 难易度：困难
牛津版（深圳·广州）2018-2019学年初中英语八年级下册Module 3 Unit 5第6课时Integration
Green sea turtles are reptiles (爬行动物). They are (find) throughout the world's seas. They are probably the oldest animals the Earth. Their ancestors(祖先) used to walk on land, and then went back the sea many million years ago. They watched dinosaurs go missing. Although they are endangered animals, the number of them is(rise). Green sea turtles are cold-blooded and they breathe air. They each have a hard shell like nearly all turtles. Many land turtles are able to take their heads back into their shells for (protect). Green sea turtles cannot do this, and their heads will be out at all times. Their shells are (light) in weight than those which live on land. When green sea turtles swim, they will come out of the sea every few (minute) to take a breath. when they sleep, they can remain in water for two hours without taking a breath. Green sea turtles seem to grow very (slow). Adult green sea turtles can weigh about 500 pounds. Green sea turtles live in the ocean most of their adult lives.
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