18.When we have small cuts in the skin(皮膚),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(細胞).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 (傷害) 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(層)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.條紋
C.縫隙
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 這篇短文主要介紹了人體皮膚的作用,重點介紹了皮膚上的傷口愈合的過程.
解答 62.C詞義猜測題.聯(lián)系上文Outside skin cells fit together closely with no,皮膚外細胞密切配合,沒有…,可知此處指的是縫隙,故選C.
63.B細節(jié)理解題.根據(jù)Cells grow and make new cells可知細胞生長并制造新細胞,故選B.
64.B細節(jié)理解題.根據(jù)Different cells have different uses可知不同的細胞有不同的用途,故選B.
65.A標題歸納題.根據(jù)How does this happen?Read on,and you will find out the secret.可知這篇短文重點介紹了皮膚上的傷口是如何愈合的,故選A,皮膚是如何治療傷口的.
點評 做題時首先要仔細閱讀短文,掌握大意,然后結(jié)合具體的題目,找出相關(guān)信息,就可以確定正確答案.