A. The engine in your body.

B. The location, size and heartbeat of a heart.

C. What happens when the heart beats?

D. How does your heart work?

E. How do we know about the heart?

F. What can a doctor tell by feeling your pulse?

71.  

    Your heart is located in your chest, a little to your left. This heart of yours, which is about the size of your two fists held together, beats about 90 times a minute. A grown person's heart beats about 60 to 80 times a minute. The heartbeat is not just the same in all persons, and it is not the same in any one person at all times.

72.  

    When your heart beats, it is pumping blood to all parts of your body. If you could examine your heart closely, you would see that it is really two pumps placed side by side, and working at the same time. Each pump has two parts, the upper part called the auricle (心房), and the lower part called the ventricle (心室). The auricles receive the blood as it comes into them after it has been pumped through the body. The ventricles pump the blood out. The right one pumps the blood to the lungs and the left one pumps the blood to all other parts of the body. At the top and bottom openings of each ventricle are valves (阀门) which make the blood go in only one direction.

73.  

    Your heart is sometimes called the engine or the motor in your body and sometimes called the pump. It works away, both day and night. First it pumps out some blood, rests for a few seconds, and then it pumps some more. In a normal day, the heart pumps about 2,500 gallons of blood from the auricles and ventricles.

74.  

    By using a stethoscope to listen to the heart, the doctor can tell whether your heart is beating evenly and whether the valves are closing tightly. The stethoscope makes these sounds so clear that the doctor can hear them easily. The stethoscope has an earpiece that he places on your chest and tubes that he places in his ear. The earpiece carries the sound or your heart's beating along the tubes to the doctor's ears, and it makes the sound seem much louder than it really is. The doctor could listen to your heartbeat by pulling his ear against your chest.

75.  

An easy experiment can help you understand what happens when the heart beats. You can do this experiment with a hollow rubber ball. Make a small hole in it, and fill the ball with water through the hole. When you squeeze the ball, you will notice how the water comes out in a spurt each time you squeeze. After each spurt the ball comes back to its round shape again. Something like this happens when your heart beats. The muscles in your heart grow smaller, or contract, and squeeze the blood out of the heart. Each time this happens, we say your heart is beating. Perhaps you have noticed that the doctor places his finger on the pulse in your wrist when you are ill. By doing this he can tell how fast your heart is beating.

In a land far away, once upon a time there was great poverty (贫困）,and only the rich could manage without great  36  . Three of those rich men and their servants were  37  together on a road when they came to a very  38  village.
The first could not stand seeing the poverty,  39  he took all the gold and jewels from his wagons (四轮载重马车) and shared  40  out among the villagers. He wished them all the best of luck, and he left.
The second rich man ,seeing the  41  situation, stopped for a short time and gave  42  all his food and drink, since he  43   see that money would be of little  44   to them. He made sure that they each  45  their fair share and would have enough food to  46  for some time . Then, he left.
The third rich man, on seeing such poverty,  47  and went straight through the  48  without stopping. The two other rich men saw this from a distance and commented with each other  49  the third rich man lacked sympathy. It was  50  that they themselves had been there to offer help.
However, three days later, they  51  the  third rich man ,who was coming in the opposite direction . He was  52  travelling quickly, but his wagons,  53  the gold and valuables they had been  54  ,were now full of farming tools and bags of  55  .He was rushing back to help them out of poverty.

In a land far away, once upon a time there was great poverty (贫困）,and only the rich could manage without great  36  . Three of those rich men and their servants were  37  together on a road when they came to a very  38  village.

The first could not stand seeing the poverty,  39  he took all the gold and jewels from his wagons (四轮载重马车) and shared  40  out among the villagers. He wished them all the best of luck, and he left.

The second rich man ,seeing the  41  situation, stopped for a short time and gave  42  all his food and drink, since he  43   see that money would be of little  44   to them. He made sure that they each  45  their fair share and would have enough food to  46  for some time . Then, he left.

The third rich man, on seeing such poverty,  47  and went straight through the  48  without stopping. The two other rich men saw this from a distance and commented with each other  49  the third rich man lacked sympathy. It was  50  that they themselves had been there to offer help.

However, three days later, they  51  the  third rich man ,who was coming in the opposite direction . He was  52  travelling quickly, but his wagons,  53  the gold and valuables they had been  54  ,were now full of farming tools and bags of  55  .He was rushing back to help them out of poverty.

1.                A．loss            B．expectations     C．success   D．problems

2.                A．standing        B．travelling        C．gathering D．running

3.                A．faraway        B．poor           C．different  D．ancient

4.                A．unless          B．because        C．so   D．if

5.                A．them           B．anything        C．nothing   D．those

6.                A．curious         B．worrying        C．dangerous     D．puzzling

7.                A．the villagers     B．his servants      C．the others     D．the rest

8.                A．could          B．might          C．should    D．must

9.                A．interest        B．concern        C．use D．attraction

10.               A．returned       B．gained         C．offered   D．received

11.               A．remain         B．last            C．supply D．share

12.               A．turned back     B．set out         C．showed off     D．speeded

13.               A．village         B．land           C．field  D．road

14.               A．whether        B．how           C．where D．when

15.               A．good          B．certain         C．true  D．strange

16.               A．welcomed      B．met            C．accepted D．persuaded

17.               A．still            B．already         C．always D．indeed

18.               A．except         B．instead of       C．apart from D．along with

19.               A．loading         B．treasuring       C．carrying   D．earning

20.               A．food           B．jewels          C．money    D．seeds

In a land far away, once upon a time there was great poverty （贫困）,and only the rich could manage without great _26_. Three of those rich men and their servants were_27_together on a road when they came to a very_28_village.

The first could not stand seeing the poverty, _29  he took all the gold and jewels from his wagons (四轮载重马车) and shared _30 out among the villagers. He wished them all the best of luck, and he left.

The second rich man ,seeing the _31  situation, stopped for a short time and gave _32  all his food and drink, since he _33  see that money would be of little _34  to them. He made sure that they each _35  their fair share and would have enough food to _36  for some time . Then, he left.

The third rich man, on seeing such poverty, _37  and went straight through the _38  without stopping. The two other rich men saw this from a distance and commented with each other_39  the third rich man lacked sympathy. It was _40  that they themselves had been there to offer help.

However, three days later, they  41 the  third rich man ,who was coming in the opposite direction . He was  42  travelling quickly, but his wagons,  43  the gold and valuables they had been  44  ,were now full of farming tools and bags of  45  .He was rushing back to help them out of poverty.

1.                A．loss            B．expectations     C．success   D．problems

2.                A．standing        B．travelling        C．gathering D．running

3.                A．faraway        B．poor           C．different  D．ancient

4.                A．unless          B．because        C．so   D．if

5.                A．them          B．anything        C．nothing   D．those

6.                A．curious         B．worrying        C．dangerous D．puzzling

7.                A．the villagers     B．his servants      C．the others D．the rest

8.                A．could          B．might          C．should   D．must

9.                A．interest        B．concern        C．use  D．attraction

10.               A．returned       B．gained         C．offered   D．received

11.               A．remain         B．last            C．supply D．share

12.               A．turned back     B．set out         C．showed off D．speeded

13.               A．village         B．land           C．field  D．road

14.               A．whether        B．how           C．where D．when

15.               A．good          B．certain         C．true  D．strange

16.               A．welcomed      B．met           C．taccepted  D．persuaded

17.               A．still            B．already         C．always D．indeed

18.               A．except         B．instead of       C．apart from D．along with

19.               A．loading         B．treasuring       C．carrying   D．earning

20.               A．food           B．jewels          C．money    D．seeds

In a land far away, once upon a time there was great poverty （贫困）,and only the rich could manage without great _36. Three of those rich men and their servants were_37_together on a road when they came to a very_38_village.

The first could not stand seeing the poverty, _39 he took all the gold and jewels from his wagons (四轮载重马车) and shared 40 out among the villagers. He wished them all the best of luck, and he left.

The second rich man ,seeing the _41 situation, stopped for a short time and gave _42 all his food and drink, since he _43  see that money would be of little _44 to them. He made sure that they each 45their fair share and would have enough food to _46 for some time . Then, he left.

The third rich man, on seeing such poverty, _47  and went straight through the _48  without stopping. The two other rich men saw this from a distance and commented with each other 49 the third rich man lacked sympathy. It was _50  that they themselves had been there to offer help.

However, three days later, they 51the  third rich man ,who was coming in the opposite direction . He was 52  travelling quickly, but his wagons,  53  the gold and valuables they had been  54  ,were now full of farming tools and bags of  55 .He was rushing back to help them out of poverty.

1.                A．loss            B．expectations     C．success   D．problems

2.                A．standing        B．travelling        C．gathering D．running

3.                A．faraway        B．poor           C．different  D．ancient

4.                A．unless          B．because        C．so   D．if

5.                A．them          B．anything        C．nothing   D．those

6.                A．curious         B．worrying        C．dangerous D．puzzling

7.                A．the villagers     B．his servants      C．the others D．the rest

8.                A．could          B．might          C．should   D．must

9.                A．interest        B．concern        C．use  D．attraction

10.               A．returned       B．gained         C．offered   D．received

11.               A．remain         B．last            C．supply D．share

12.               A．turned back     B．set out         C．showed off D．speeded up

13.               A．village         B．land           C．field  D．road

14.               A．whether        B．how           C．where D．when

15.               A．good          B．certain         C．true  D．strange

16.               A．welcomed      B．met           C．accepted  D．persuaded

17.               A．still            B．already         C．always D．indeed

18.               A．except         B．instead of       C．apart from D．along with

19.               A．loading         B．treasuring       C．carrying   D．earning

20.               A．food           B．jewels          C．money    D．seeds