Unit 3 Under the sea 绿海龟是世界上最大的硬壳海龟，体重最重可达204公斤。目前全世界80多个国家的海岸线上都有它们的踪迹。现在就让我们一起去探知绿海龟的生活习性吧！ Green Sea Turtles Green sea turtles are the world’s largest species of hard?shelled sea turtle. While most of them weigh about 136 to 181 kilograms, some can be as heavy as 204 kilograms. These turtles are found nesting along the coastline of more than 80 countries, with the largest nesting populations found in Costa Rica and Australia. Green sea turtles spend most of their lives underwater, where they can rest for up to five hours at a time before coming up for air. Green sea turtles are also known to sunbathe(晒日光浴) on land. Unlike most other sea turtles, adult green sea turtles eat a primarily plant?based diet consisting of seaweed and sea grass. Scientists believe these green foods give the sea turtle’s fat its green color. The shell of the green sea turtle is usually a shade of brown or olive. Similar to other sea turtles, green sea turtles migrate long distances between their feeding grounds and their nesting sites, with recorded distances of longer than 2，600 kilometers. Female green sea turtles leave the water in order to lay eggs on the beach and will choose the same nesting spot as where they were born. A female will dig out a nest and lay about 115 eggs. Then she’ll cover the eggs with sand and return to the sea. After about two months, the babies will hatch(孵化) from their eggs. The first few years of a green sea turtle’s life are spent floating at sea, where they feed on plankton(浮游生物). As they grow older, the turtles move to waters along the coast where they find sea grass to eat. Adult green sea turtles face many threats, primarily from humans, including injuries from boats, being caught in fishing nets and pollution. Newly hatched sea turtles are also at risk of being hunted by animals such as birds, crabs, and raccoons as they move from their nests out to the sea. Section Ⅰ Warming Up & Reading—Comprehending 重点单词 写作词汇 1.witness vt. 当场见到；目击 n. 目击者；证人；证据 2.opposite prep. 在……对面 adj. 相对的；相反的 3.pause vi.& n. 暂停；中止 4.teamwork n． 协作；配合 5.relationship n． 关系；血缘关系；交往 6.urge vt. 催促；极力主张；驱策 7.meantime adv. 其间；同时 拓展词汇 8.annual adj.每年的；按年度计算的 n．年刊；年鉴→annually adv.每年；一年一度地 9.accommodation n．住所；住宿→accommodate vt.提供住宿 10.flee vi.逃避；逃跑 vt.逃离→fled(过去式)→fled(过去分词) 11.drag vt.拖；拉；扯→dragged(过去分词)→dragging(现在分词) 12.depth n．深(度)；深处→deep adj.深的→deepen v．加深 13.abandon vt.放弃；遗弃；抛弃→abandoned adj.被遗弃的；放纵的 14.conservation n．保存；保护→conserve v．保存 阅读词汇 15.anecdote n． 轶事；奇闻 16.shore n. 岸；海滨 17.yell vi. 大叫；呼喊 n. 叫声；喊声 18.dive vi.& n． 跳水(的动作)；潜水 (的动作)；俯冲 19.harpoon n. (捕鲸用的)鱼叉 20.shark n. 鲨鱼 重点短语 1.at the beginning of ... ...
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