The Sea
What do you know about the sea? We know that it looks very pretty when the sun is shining on it. We also know that it can be very rough when there is a strong wind.What other things do we know about it?
The first thing to remember is that the sea is very big. When you look at the map of the world you will find there is more water than land.The sea covers three quarters of the world.
The sea is also very deep in some places. It is not deep everywhere. Some parts of the sea are very shallow. But in some places the depth of the sea is very great. There is one spot, near Japan, where the sea is nearly 11 kilometers deep! The highest mountain in the world is about 9 kilometers high. If that mountain were put into the sea at that place, there would be 2 kilometers of water above it! What a deep place!
If you have swum in the sea, you know that it is salty. You can taste the salt. Rivers, which flow into the sea, carry salt from the land into the sea. Some parts of the sea are saltier than other parts. There is one sea, called the dead Sea, which is very salty. It is so salty that swimmers cannot sink! Fish cannot live, in the Dead Sea!
In most parts of the sea, there are plenty of fishes and plants. Some live near the top of the sea. Others live deep down. There are also millions of tiny living things that float in the sea. These floating things are so small that it is hard to see them. Many fishes live by eating these.
The sea can be very cold.Divers, who go deep down in the sea, know this. On the top the water may be warm. When the diver goes downwards, the sea becomes colder and colder. Another thing happens. When the diver goes deeper, the water above presses down on him. It squeezes him. Then the diver has to wear clothes made of metal. But be cannot go very deep. Some people who wanted to go very deep used a very strong diving ship. They went down to the deepest part of the sea in it. They went down to a depth of eleven kilometers !
第 41 题 When does the sea look beautiful?
A.When it is calm.
B.When the weather is fine.
C.When there is a strong wind.
D.When there is a storm.
第1题
下列商品中,需求价格弹性小的是()。
A.替代品较多的商品
B.用途多的商品
C.贵重的首饰
D.生活必需品
第2题
下列商品中,需求价格弹性小的是()。
A.替代品较多的商品
B.用途多的商品
C.贵重的首饰
D.生活必需品
第3题
下列商品中,需求价格弹性小的是()。
A.替代品较多的商品
B.用途多的商品
C.贵重的首饰
D.生活必需品
第4题
下列商品中,需求价格弹性小的是()。
A.替代品较多的商品
B.用途多的商品
C.贵重的首饰
D.生活必需品
第5题
下列商品中,需求价格弹性小的是()。
A.替代品较多的商品
B.用途多的商品
C.贵重的首饰
D.生活必需品
第6题
下列商品中,需求价格弹性小的是()。
A.替代品较多的商品
B.用途多的商品
C.贵重的首饰
D.生活必需品
第10题
A.—种商品若有许多相近的替代品,这种商品的需求价格弹性大
B.—种商品若属于生活基本必需品,则这种商品的需求弹性大
C.一般来说,一种商品的用途越多,需求弹性就越大
D.—般来说,时间越短,商品的需求弹性越小;时间越长,商品的需求弹性就越大
E.贵重首饰、高档服装等非必需的高档商品,需求弹性小
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