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  If a man in a spaceship looked down at the earth, he would see mainly water. He might think that the earth was one giant ocean with little land.

  Nearly seven-tenths of the earth's surface is covered by water. One ocean, the Pacific (太平洋), has an area of 63 million square miles.

  Many years ago people thought that the land under all this water was flat. Now they know that this is not true. There are as many mountains under the sea as there are on the land.

At first, there was very little salt in the sea. The salt was brought into the, sea by rivers. It is possible to measure the age of the earth by measuring the amount of salt in the sea. Scientists can calculate how many years it took for this amount of salt to be carried from the land into the sea.

(1)Nearly ____of the earth's surface is covered by water.

[  ]

Aseven-tenths

Bthree-tenths

Cseven-tenth

Dthree-tenth

(2)Long time ago people thought that the land under the sea was_____

[  ]

Amountains

Ba ball fo gas

Cfull of coal

Dflat

 

(3)In fact, under the sea the land _________

[  ]

Ais full of mountains

Bis almost flat

Cis full of coal

Dis a ball of gas

(4)At first, there was ________

[  ]

Aa little salt in the sea

Bmuch salt in the sea

Clittle salt in the sea

Dno salt in the sea

(5)We can know the age of the earth by measuring ________

[  ]

Athe amount of water in the sea

Bthe amount of flat in the sea

Cthe amountofmountainsinthesea

Dthe amount of salt in the sea

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