18.When we have small cuts in the skin(皮肤),something strange may happen.The cuts are able to heal (疫愈)themselves in a couple of days.How does this happen?Read on,and you will find out the secret.
Every living thing on the earth is made up of cells(细胞).Cells grow and make new cells.Most cells are very tiny and we can't see them with our eyes.Different cells have different uses.Our skin cells are special ones.The cells on the surface(表 面)of our skin are old dead cells.New skin cells are right under the surface.These are the living skin cells.They do work for our bodies.They help protect our bodies and heal cuts.
Our bodies make skin cells all the time.As the old cells fall off,new cells grow in the same place.Each person makes about 18kg of skin cells during his or her life.Surface skin cells fit together closely with no gaps between them.When you cut or burn yourself,you can harm (伤害) your skin cells.A small cut will not do much harm.Your skin will quickly heal itself by making new skin cells.How do skin cells work?First,the cells near the cut get bigger and move into the gap.Next,these bigger cells meet in the middle.They form a new layer(层)of skin cells.Finally,new cells will grow until the gap disappears completely.In this way,your skin can grow and get well itself.
How amazing the tiny cells are!Next time you have a cut,don't worry about it.Maybe in a few days,you will be surprised to find it healed.
62.The underlined word"gaps"in the passage means"C"in Chinese.
A.突起
B.条纹
C.缝隙
D 差距
63.From the passage,we know thatB.
A.cells are large and we can see them with our eyes
B.cells can grow and make new cells
C.cells aren't in most living things
D.cells near the cut get smaller and move into the gap.
64.Which of the following is TRUE according to the passage?B
A.Each person can make 18kg of skin cells every day.
B.Different cells have different uses in our bodies.
C.The skin cells have little work to do in the body.
D.We can see most cells with our eyes.
65.The best title for this passage should beA.
A.HOW SKIN CELLS HEAL CUTS
B.THE IMPORTANCE OF SKIN
C.HOW TO PROTECT OUR FINGERS
D.THE WAY OF MAKING CELLS.
分析 这篇短文主要介绍了人体皮肤的作用,重点介绍了皮肤上的伤口愈合的过程.
解答 62.C词义猜测题.联系上文Outside skin cells fit together closely with no,皮肤外细胞密切配合,没有…,可知此处指的是缝隙,故选C.
63.B细节理解题.根据Cells grow and make new cells可知细胞生长并制造新细胞,故选B.
64.B细节理解题.根据Different cells have different uses可知不同的细胞有不同的用途,故选B.
65.A标题归纳题.根据How does this happen?Read on,and you will find out the secret.可知这篇短文重点介绍了皮肤上的伤口是如何愈合的,故选A,皮肤是如何治疗伤口的.
点评 做题时首先要仔细阅读短文,掌握大意,然后结合具体的题目,找出相关信息,就可以确定正确答案.