Question

【题目】下面文章中有5个段落需要添加小标题（第1—5题）。请从以下选项（A、B、C、D、E、F）中选出符合各段意思的小标题。选项中有多余选项。

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?

【1】_______ 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．

【2】________ 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．

【3】______ 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 80times 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．

【4】_______ 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 ears．The earpiece carries the sound of 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 ears against your chest．

【5】_______ 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．

Answer 1

【答案】

【1】A

【2】D

【3】B

【4】E

【5】C

【解析】

试题解析：

【1】在总起句后面的一句中有engine一词，可知此题的总起句是与engine有关的，故选A。

【2】分析题目，可知此段主要讲述的是heart beats 的内容，故可推断D为正确的选项。

【3】根据此段中出现的几个关键词located，size，heart beats，可知B为正确答案。

【4】分析本段的内容大意，可知此段主要介绍的是医生如何通过听人的心跳而断症的，故E选项的内容与之相符。

【5】根据此空格后的一句中的when the heart beats，可知C选项的意思与之相符。