题目内容
10.When we have small cuts in the skin(皮肤),something strange may happen.The cuts are able to heal(痊愈) 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 1 8kg of skin cells during his or her life.Surface skin cells fit together closely with no gaps between them.When you cut or bum yourself,you can harm 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.
根据短文内容选择最佳答案.
46.The underlined word"gaps"in the passage means"C"in Chinese.
A.突起
B.条纹
C.缝隙
47.From the passage,we know that cellsB.
A.are large and we Call see them with our eyes
B.can grow and make new cells
C.aren't in most living things
48.Skin cells heal cuts in three steps.B is the right order.
A.a→b→c
B.b→c→a
C.a→c→b
49.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.
50.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.
分析 文章大意: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 46-50 CBBBA
46题答案:C 词汇题.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.
47题答案:B 细节题.根据第二段Cells grow and make new cells.描述细胞生长并制造新细胞,可知选B.
48题答案:B 细节题.根据最后一段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.描述皮肤细胞如何首先工作,切口附近的细胞变大并进入间隙.接下来,这些大细胞在中间相遇.它们形成一层新的皮肤细胞.最后,新的细胞将增长,直到缝隙消失,可知选B.
49题答案:B 细节题.根据第二段Different cells have different uses.描述不同的细胞有不同的用途,可知选B.
50题答案:A 主旨题.根据第一段When we have small cuts in the skin(皮肤),something strange may happen.The cuts are able to heal(痊愈) themselves in a couple of days.How does this happen?Read on,and you will find out the secret.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 本文浅显易懂,各个小题都能在文中找到适当依据.只要认真阅读短文,注意前后联系,就能顺利完成阅读.文章所设试题主要考察细节查找,做题关键是找出原文的根据,认真核查小题和原文的异同.
| decorate worry mix not pull discuss |
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