人教版（2019）选择性必修四英语《Unit 3 Sea Exploration》Reading and Thinking优秀教学ppt课件

人教版（2019）选择性必修四英语《Unit 3 Sea Exploration》Reading and Thinking优秀教学ppt课件

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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 coastline① of more than 80 countries,with the largest nesting populations found in Costa Rica and Australia.

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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 sunbathe② on land.?

Unlike most other sea turtles,adult green sea turtles eat a primarily③ plant-based diet consisting of seaweed and sea grass.Scientists believe these green foods give the sea turtle’s fat its green colour.The shell of the green sea turtle is usually a shade of brown or olive.

Similar to other sea turtles,green sea turtles migrate④ long distances between their feeding grounds and their nesting sites,with recorded distances of longer than 2,600 kilometres.

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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 hatch⑤ 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.

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