Green sea turtles （海龟) are the world&39;s largest species of hard-shelled seaturtle. Whi

Green sea turtles (海龟) are the world&39;s largest species of hard-shelled seaturtle. While most individuals weigh about 136 to 181 kilograms, some can be __56__heavy as 204 kilograms. These turtles are found nesting (筑巢) along the coastlineof more than 80 countries, with the largest nesting populations __ 57__ in Costa Ricaand Australia.

Green sea turtles spend most of their lives underwater, __58__ they can restfor up to five hours at a time before __ 59__ up for air. When active, they typically stayunderwater for a few minutes and swim up to the surface to __60__ air for a few seconds. Green sea turtles also bathe in the sun __ 61__ land.

Unlike most other sea turtles, adult green sea turtles eat primarilyplant-based foods __ 62__ of seaweed and sea grass. Scientists believe these green foods __ 63__ the sea turtle&39;s fat its green color.

Similar to other sea turtles, green sea turtles travel long distances __64__their feeding grounds and their nesting sites, with recorded distances __ 65__ than 2,600kilometers. They have strong flippers (鳍形肢) that help them __ 66__ in the water.

Female green sea turtles leave the water in __ 67__ to lay eggs on thebeach and will choose the same nesting __ 68__ as where they were born. A female willdig __ 69__ a nest with her flippers and lay about 115 eggs. Then she&39;ll cover theeggs __ 70__ sand and return to the sea. After about two months, the babies will usea special "egg tooth" to break their shells and hatch (孵化) from their eggs.

The first few years of a green sea turtle&39;s life are spent __ 71__ at sea,where they feed on tiny animals and plants __ 72__ live in the surface layer of the sea. As they grow older, the turtles move to __ 73__ waters along the coast, where theyfind sea grass to eat.

Adult green sea turtles face many threats, primarily from humans, includinginjuries from passing boats, being __ 74__ in fishing nets and pollution. Newlyhatched sea turtles are also at __ 75__ of being hunted by other animals as theymove from their nests out to the sea.

56_________

A.at

B.for

C.in

D.as

57A.gone

B.moved

C.found

D.knocked

58A.where

B.which

C.that

D.when

59A.join

B.come

C.joining

D.coming

60A.breathe

B.draw

C.hold

D.attract

61A.for

B.at

C.on

D.in

62A.putting

B.making

C.containing

D.consisting

63A.take

B.give

C.taken

D.given

64A.among

B.within

C.between

D.beyond

65A.longer

B.deeper

C.richer

D.higher

66A.arrive

B.swim

C.reach

D.jump

67A.way

B.place

C.method

D.order

68A.lawn

B.street

C.level

D.spot

69A.out

B.away

C.above

D.below

70A.of

B.with

C.out

D.for

71A.float

B.think

C.floating

D.thinking

72A.when

B.that

C.what

D.where

73A.negative

B.careful

C.shallow

D.polite

74A.caught

B.dropped

C.grown

D.reached

75A.risk

B.sight

C.visit

D.death

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