题目内容
阅读理解
If you looked at the Pacific Ocean from a space capsule (宇宙密封小舱) , you might think that the world was all water. You would hardly be able to see any land at all. Water covers most of the earth's surface.
The sea contains a large number of substances, besides common salt. If you boiled away some seawater, you would find over forty different materials. For example, out of a cubic mile of water, you would get ninety-four tons of silver and three tons of gold! If it were possible to do this, it still wouldn't be worth the trouble. It would cost more to get these expensive metals than they are worth. But the sea provides us with a great many materials which we can get easily and which we use a lot. For example, We use huge quantities of sand in industry to make glass, detergent (清洁剂) and cement (水泥) .
Besides materials like salt and sand we get a great deal of food from the sea. One day, we may even have undersea farms. We have hardly begun to explore the sea. In some ways it is less familiar from outer space.
1.You would hardly be able to see any land at all because ________.
[ ]
A.the space capsule was too high from the earth
B.You only looked at the Pacific
C.water covers most of the land
D.your eyesight was weak
2.Besides 94 tons of silver and 3 tons of gold in a cubic mile of water, there are ________.
[ ]
A.3 tons of water
B.3 tons of salt
C.3 tons of metals
D.3 tons of salt, water and other substances
3.It is ________ to boil away a cubic mile of seawater to get a large number of substances.
[ ]
4.Which is right?
[ ]
A.We have had undersea farms.
B.We can have undersea farms in the future.
C.It is impossible to have under sea farms.
D.Having undersea farms is too difficult to do.
5.“In some ways it is less familiar than outer space”means
[ ]
A.the sea is too deep to explore.
B.man daren't explore the sea.
C.man has already began to explore the sea.
D.it is more easy to explore outer space than the sea.
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