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 fish 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 fish live by eating these floating things.

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 he 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!

66. 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.

67. How much of the earth’s surface does land cover?

A. 15%                 B. 25%                  C. 30%                 D. 45%

68. Why does the author mention the sea somewhere near Japan?

A. To show that the sea in some places is very deep.

B. To show that the sea in some places is very shallow.

C. To show that its depth is 9 kilometers greater than the height of the highest mountain.

D. To show that its depth is 11 kilometers greater than the height of the highest mountain.

69. Which of the following statements about the Dead Sea is NOT true?

A. There are plenty of fish in it.

B. It is a safe place for swimmers.

C. It is extremely salty.

D. No fish can be found in it.

70. Why can’t people go very deep in the sea?

A. Because the deepest part of the sea is very cold.

B. Because the deepest part of the sea is very rough.

C. Because the pressure of the water at great depths is unendurable.

D. Because fierce fish usually live there.

_______the Second World war broke out?

A. When it was that   B. When was it that   C. When was that     D. When was it

It was reported that as many as 50% of patients do not take medicine ______ directed, ______ has drawn doctor’s attention.

A. when; it          B. as; what       C. as; which          D. that; and

  To extinguish （熄灭）different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. Most portable （手提式的）kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, buses and planes to carry extinguishers.

 Since fuel（燃料）, oxygen and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire. If the heat is reduced by cooling the material below a certain temperature, the fire goes out. The cooling method is the most common way to put out a fire. Water is the best cooling material because it is low in cost and easy to get.

 Another method of extinguishing fire is by cutting off the oxygen. This is usually done by covering the fire with sand, steam or some other things. A blanket may be used do cover a small fire.

 A third method is called separation, which includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel.

 The method that is used to put out a fire depends on the type of fire. Fires have been grouped in three classes（级别）. Fires in wood, paper, cloth and the like are called Class A fires. These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water.

1.If a fire breaks out on a bus, which of the following should be ready there for you to use?

 A. Sand                 B. An extinguisher      C. A blanket.           D. Water

2.To cover a small piece of burning wood with a basin in order to stop the fire is an example of _______.

 A. separating the fire                             B. cutting off the oxygen

 C. removing the fuel                               D. reducing the heat

3.In choosing how to put out a fire, we should first be clear about_______.

 A. when it breaks out                 B. how it comes about

 C. what kind it is                      D. where it takes place

4.What would the author probably discuss in the paragraph that follows?

 A. Another class of fires                       B. Another type of extinguishers

 C. How fires break out.                        D. How fires can be prevented.

   To extinguish (熄灭) different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. Most portable (手提式的) kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, buses and planes to carry extinguishers.

    Since fuel, oxygen (氧气) and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire. If the heat is reduced by cooling the material below a certain temperature, the fire goes out. The cooling method is the most common way to put out a fire. Water is the best cooling material because it is low in cost and easy to get.

    Another method of extinguishing fire is by cutting off the oxygen. This is usually done by covering the fire with sand, steam or some other things. A blanket may be used do cover a small fire.

    A third method is called separation, which includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel.

    The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes. Fires in wood, paper, cloth and the like are called Class A fires. These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water.

68. If a fire breaks out on a bus, which of the follow should be ready there for you to use?

A. Sand           B. Water         C. A blanket.           D. An extinguisher.

69. To cover a small piece of burning wood with a basin in order to stop the fire is an example of         .

A. separating the fire                                 B. reducing the heat

C. removing the fuel                                 D. cutting off the oxygen

70. In choosing how to put out a fire, we should first be clear about          .

A. when it breaks out                                B. how it comes about

C. what kind it is                                       D. where it takes place

71. What would the author probably discuss in the paragraph that follows?

A. Another class of fires                                   B. Another type of extinguishers

C. How fires break out.                                 D. How fires can be prevented.