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 hard­shelled 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 plant­based 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．    　sort out sth    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        在……开始时
2.hear of/about      听说
3.sort out      整理
4.ahead of      在……前面
5.race after　  　      追赶
6.in the meantime      在此期间；与此同时
7.hold up      举起
8.help (...) out      帮助(某人)摆脱困境或危难
重点句型
1.It was a 那是一个……时期：It was a time when(那是一个……时期) the killer whales, or “killers” as they were then called, helped the whalers catch the baleen whales that were on their annual migration.
2.be about to do sth.正要做某事：This was the call that announced there was about to be a whale hunt(猎鲸行动马上就要开始).
3.see sb.being done看到某人正在被……：It took over half an hour to get the boat back to James, and when we approached him, I saw James being firmly held up in the water by Old Tom(看到老汤姆正在水中稳稳地托着詹姆斯).
Fast­reading
Skim the text and  answer the following question.
The text is mainly about ________．
A．the killer whales are easily trained
B．the killer whales can help the whalers catch the huge whales
C．the killer whales kill the whales for their food
D．the killer whales drag the whales under the water
答案：B
Careful­reading
Read the text carefully and choose the best answer.
1．What happened to James after he was washed off the boat?
A．He got hurt by a shark.
B．He was abandoned by the other whalers and felt terrified.
C．He dropped his hope and was nearly dying.
D．He was held up in the water by Old Tom and rescued.
2．Why did George beat the water with his oar?
A．To frighten the whales away.
B．To call back Old Tom to lead the way.
C．To attract the attention of huge whales.
D．To send signals to other whales.
3．We can infer from the text that ________．
A．the killer whales may be trained by the whalers
B．the killer whales want to help man catch the whales themselves
C．the killer whales need no training for helping the whalers
D．the killer whales want to eat the whales after killing them

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