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 The salmon (大马哈鱼) is a very strange fish. It is born in a river. But the young salmon takes 2 years to swim down the rivers towards the Pacific Ocean. For another 2 years it lives in the sea and becomes full grown. Then it returns to the river where it was born.

  A grownup salmon weighs about 25 pounds and is nearly three feet long. The female salmon will not lay the eggs (产卵) in the Pacific Ocean. When it is almost time to lay them,both male and female salmon begin a great journey. Each salmon is heading for the river where it was born. A salmon may be a thousand miles from where its life began,yet it is able to return to that place.

  As the salmon swim,larger fish attack (袭击) them. The salmon are food for some other fish. Some are caught by fishermen. The salmon that are left keep swimming.

  After they enter the rivers,they head upstream (向上游) .If rocks and waterfalls (瀑布) are in their way,the salmon leap (^) over them. A salmon can leap up a fall as high as ten feet. It leaps by swimming at full speed under water,then rising to the surface. Almost the whole body of a salmon is made of muscle (肌肉) .It is these powerful muscles that make the salmon fit for fast swimming,turning quickly,and leaping high out of the water.

  Some reach their river in summer,others in the early autumn. They have come hundreds,even thousands of miles and it has taken them weeks and months.

(   ) 6. The young salmon was born        and grows up .

   A. in a river. . . in the river   B. in a river. .. in the sea

   C. in a sea... in the sea   D. in a sea. . . in the river

(   ) 7.         ,both male and female salmon will return to where they were born.

   A. When it is almost time for a female salmon to lay eggs

   B. After the female salmon has laid the eggs

   C. When they weigh 25 pounds and are nearly three feet long

   D. After they have lived in the Pacific Ocean for 4 years

(   ) 8. On their way back to the birth place,         salmon are eaten by larger fish and

       caught by fishermen.

   A. most. . . the others   B. some. . . the others

   C. most. . . the rest   D. some. . . others

(   ) 9.        swims down the rivers toward the Pacific Ocean while        swims upstream to the river where it was born.

   A. The young salmon.. . the grownup salmon

   B. A male salmon. . . a female salmon

   C. A baby salmon. . . both male and female salmon

   D. A grownup salmon. . . a baby salmon

(   ) 10. Powerful muscles make the salmon        swim fast,turn quickly and leap high out of the water.

   A. fit for   B. can   C. to   D. able to

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