Ways to Deal with the Problem of Energy
There are different ways in which people try to deal with the problem of energy.One way is the greater production of common energy sources,such as coal,oil and gas.The trouble with these sources,however,is that they are not renewable.
Another way is energy conservation(节能),which means using energy more efficiently.In some very cold countries people build special houses to save energy.They place materials between the inside and the outside of the walls of the house to keep the cold out and warmth in.The house is heated by the lights,the body heat of the people and the other equipment in it.
Finally,renewable energy sources are used even though they are often expensive to develop.One form of these is geothermal energy.In certain parts of the world the temperature of the earth increases thirty degrees centigrate with each kilometer down.At six kilometers,therefore,it rises to nearly 200degrees.To get the heat,water is pumped down into the rocks and back up to the surface.Heat from the earth is already used in certain countries.
【小题1】The writer tells about “the special houses”because they______.

Ways to Deal with the Problem of Energy
There are different ways in which people try to deal with the problem of energy.One way is the greater production of common energy sources,such as coal,oil and gas.The trouble with these sources,however,is that they are not renewable.
Another way is energy conservation(节能),which means using energy more efficiently.In some very cold countries people build special houses to save energy.They place materials between the inside and the outside of the walls of the house to keep the cold out and warmth in.The house is heated by the lights,the body heat of the people and the other equipment in it.
Finally,renewable energy sources are used even though they are often expensive to develop.One form of these is geothermal energy.In certain parts of the world the temperature of the earth increases thirty degrees centigrate with each kilometer down.At six kilometers,therefore,it rises to nearly 200degrees.To get the heat,water is pumped down into the rocks and back up to the surface.Heat from the earth is already used in certain countries

1. 1.

   The writer tells about “the special houses”because they______

   1. A.
      show the excellent skills of the builders
   2. B.
      serve as an example of the energy conservation
   3. C.
      are heated by different sources of energy
   4. D.
      are warmer than other types of energy
2. 2.

   The underlaned words”geothermal energy”in the third paragraph mean____

   1. A.
      renewable source
   2. B.
      underground source
   3. C.
      heat inside the earth
   4. D.
      temperature of the earth
3. 3.

   At a place where the surface temperature is 15degrees centigrade,how deep do you have to dig so as to get a temperature of 75 degrees centigrade?

   1. A.
      One km
   2. B.
      Two km
   3. C.
      Three km
   4. D.
      Four km

         Ways to Deal with the Problem of Energy

  There are different ways in which people try to deal with the problem of energy.One way is the greater production of common energy sources,such as coal,oil and gas.The trouble with these sources,however,is that they are not renewable.

  Another way is energy conservation(节能),which means using energy more efficiently.In some very cold countries people build special houses to save energy.They place materials between the inside and the outside of the walls of the house to keep the cold out and warmth in.The house is heated by the lights,the body heat of the people and the other equipment in it.

  Finally,renewable energy sources are used even though they are often expensive to develop.One form of these is geothermal energy.In certain parts of the world the temperature of the earth increases thirty degrees centigrate with each kilometer down.At six kilometers,therefore,it rises to nearly 200degrees.To get the heat,water is pumped down into the rocks and back up to the surface.Heat from the earth is already used in certain countries.

73.The writer tells about “the special houses”because they______.

 A.show the excellent skills of the builders

 B.serve as an example of the energy conservation

 C.are heated by different sources of energy

 D.are warmer than other types of energy

74.The underlaned words”geothermal energy”in the third paragraph mean____.

 A.renewable source                 B.underground source

 C.heat inside the earth               D.temperature of the earth

75.At a place where the surface temperature is 15degrees centigrade,how deep do you have to dig so as to get a temperature of 75 degrees centigrade?

 A.One km.       B.Two km.         C.Three km.        D.Four km.

Natural ways of keeping time

In ancient times, people had to use the sun and the moon to tell time. They got up when the sun came up and worked in the fields until the sun went down.

Man-made things

The sand clock is made of two glass balls joined by a narrow neck. The top ball was filled with sand. The sand slowly moved through the neck into the bottom ball. People knew how much time had passed when all the sand had fallen to the bottom ball.

People also made the water clock. They made a small hole near the bottom of a pot. Then they filled the pot with water. Markings inside the pot showed how much time passed as the water dripped (滴) out of the hole.

Nature’s Clocks in Living Things

◆Animals’ Body Clock

Animals do not need clocks to know time. They have a way of telling time by their bodies. Birds know when to fly to warmer places before winter. Some animals know when to keep more food for the cold winter months. Some fish know when it is time to move up the river and lay eggs.

◆Plants have their own clocks

Plants also have their own clocks to keep time. Plants know when to open flow??ers or when to drop their leaves.

◆The Body Clock in Human Beings

People also have their own body clocks. When we get used to our lives, our body clocks can be very accurate (准确的). It can tell us when it is time to wake up. It can also tell us when to eat or to go to sleep.

How could an ancient farmer know when to go back home in the daytime?

A. By looking at the moon.              B. By looking at the stars.

C. By looking at the sun.                D. By feeling whether tired or not.

How many kinds of living things with nature’s clocks are mentioned here?

A. 2.           B. 3.             C. 5          D. 6.

From the passage, we know what man-made things have in common is that_______.

A. both of them have a hole.                      B. both of them are designed with glass balls.

C. both of them can be used only once.        D. both of them tell time in the same way

Natural ways of keeping time


In ancient times, people had to use the sun and the moon to tell time. They got up when the sun came up and worked in the fields until the sun went down.
Man-made things
The sand clock is made of two glass balls joined by a narrow neck. The top ball was filled with sand. The sand slowly moved through the neck into the bottom ball. People knew how much time had passed when all the sand had fallen to the bottom ball.
People also made the water clock. They made a small hole near the bottom of a pot. Then they filled the pot with water. Markings inside the pot showed how much time passed as the water dripped (滴) out of the hole.
Nature’s Clocks in Living Things
◆Animals’ Body Clock
Animals do not need clocks to know time. They have a way of telling time by their bodies. Birds know when to fly to warmer places before winter. Some animals know when to keep more food for the cold winter months. Some fish know when it is time to move up the river and lay eggs.
◆Plants have their own clocks
Plants also have their own clocks to keep time. Plants know when to open flow­ers or when to drop their leaves.
◆The Body Clock in Human Beings
People also have their own body clocks. When we get used to our lives, our body clocks can be very accurate (准确的). It can tell us when it is time to wake up. It can also tell us when to eat or to go to sleep.
【小题1】How could an ancient farmer know when to go back home in the daytime?