题目内容

A woman suffering from cancer during pregnancy can pass the disease on to her unborn child, scientists have shown in a study that solves a puzzle that has confused doctors for a century.

The rare occurrence of a mother and child appearing to share the same cancer---of which there have been about 30 known cases---is a result of genetic mutation (基因突变) that allows the cancer to pass to the baby unnoticed.

There was previously no genetic evidence to explain why a child’s immune system would not recognize and destroy any invasive cancer cells that were of maternal---and therefore, foreign origin.

The new study, led by Mel Greaves, of the Institute of Cancer Research (ICR), and published in Proceedings of the National Academy of Sciences, used advanced genetic fingerprinting to prove that infant’s leukaemic cells (白血病细胞) were unquestionably of maternal origin.

The case, involving a Japanese mother aged 28 and her daughter, showed that both patients’ leulaemic cells carried the identical transformed cancer gene BCR-ABL even though the infant had not inherited (遗传的) this gene.

This meant that the child, who had cancer diagnosed at 11 months, old, could not have developed this type of leukaemia in isolation.

To investigate how the cells could have crossed the placental barrier (胎盘膜) and survived in the offspring (后代), the scientists looked for evidence of some form of immunological (免疫学的) acceptance of tolerance of the foreign cells by the foetus (胎儿).

Professor Greaves, who worked with colleagues in Japan with funding from Leukaemia Reasearch, said that it had bee assumed that cancer spread was impossible because of the placenta’s role in preserving materno-foetal (母体-胎儿) health.

61.  What is the main idea of the passage?

A. An Unborn child can be infected by the mother with cancer.

B. Scientists have solved a confusing puzzle for a century.

C. A genetic mutation leads to the cancer of the unborn child.

D. Women can’t be cured during pregnancy.

62.  Which of the following statements is true according to the passage?

A. There are many cases of a genetic mutation causing cancer.

B. No genetic evidence is known why the unborn child was infected.

C. Mel Greaves’s study indicates the infant’s leukaemic cells were of maternal origin.

D. Based on Mel Greaves’s study, mothers may know cancer’s transportation.

63.  What was used to prove the infant’s leukeaemic cells were from the mother?

A. genetic mutation      B. placental barrier 

C. immune system       D. genetic fingerprinting

64.  What does the underlined phrase “in isolation” mean in the 6 paragraph?

A. in a hurry    B. in no way    C. on purpose    D. on its own

65. What can we infer from the passage?

   A. The placental barrier doesn’t prevent any disease.

   B. Earlier theories supposed cancer couldn’t go across placenta.

   C. Scientists have got evidence for some diseases.

   D. Professor Greaves gets money from the government.  

练习册系列答案
相关题目

阅读下列短文,根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

   (请将答案写在答题纸的指定区域内)

On a typical hot August day in Xianyou County, Fujian Province, Zeng Demei, a retired worker in his seventies, hurries down a busy street.In his hand is a black leather bag.Zeng opens his bag, taking out two forms.      _____

       Each of the forms contains detailed information of a student.On his arrival two hours later a woman greets him and leads him to her office where another man is waiting.They are the two village officials.They inspect the forms handed to them by Zeng and immediately recognize the girls.    _____ ? "It’s a pity but it doesn't matter." says Zeng, who wastes no time in deciding to look for the remaining child, Su Qiuju.

       After half an hour, they stop outside a small house made of mud brick.A middle-aged man and a girl in a faded pink dress greet them.Su Qiuju is eight years old.She was forced to drop out of school after both her parents died.She is now living with her uncle who cannot afford his own children's education.However, the year of education Su Qiuju did complete was a successful one.     _____  .

       When they are about to leave, Zeng says, "I must find a supporter for this girl to sponsor her education." Zeng has made it his retirement task to help children complete their schooling.Back in 1999, Zeng took part in a campaign started by the local women's organization to help students from poor families.     __________ 

       His task had begun and since then he has spent his time persuading his friends and neighbors and others to donate money."To me, children's education is the most important.    _____ I have to find sufficient funding before the school opens in September."

       When asked how long he will keep up his vital work as the community's guardian angel, he has a simple reply." Not until my eyes can't see, and my feet can't move."

       A.They were having problems with their schoolwork

       B.These are for the two girls he's going to visit this morning

       C.They live in a small village not very far, though only one of the girls is still living at home

       D.She displayed a talent for handwriting, writing her three-character name neatly and

beautifully

       E.The thought of students dropping out of school bothers me so much that I can't get to sleep

at night

       F.Of course, some people question why I would want to give up my retirement to go to so

much trouble

       G.He was so overcome by the tough situation of many poor children ?that he donated all his

money to help out a girl

On a typical hot August day in Xianyou County, Fujian Province, Zeng Demei, a retired worker in his seventies, hurries down a busy street.In his hand is a black leather bag.Zeng opens his bag, taking out two forms.

1..

         Each of the forms contains detailed information of a student.On his arrival two hours later a woman greets him and leads him to her office where another man is waiting.They are the two village officials.They inspect the forms handed to them by Zeng and immediately recognize the girls.2.? "It’s a pity but it doesn't matter." says Zeng, who wastes no time in deciding to look for the remaining child, Su Qiuju.

         After half an hour, they stop outside a small house made of mud brick.A middle-aged man and a girl in a faded pink dress greet them.Su Qiuju is eight years old.She was forced to drop out of school after both her parents died.She is now living with her uncle who cannot afford his own children's education.However, the year of education Su Qiuju did complete was a successful one.3.

         When they are about to leave, Zeng says, "I must find a supporter for this girl to sponsor her education." Zeng has made it his retirement task to help children complete their schooling.Back in 1999, Zeng took part in a campaign started by the local women's organization to help students from poor families.4..

         His task had begun and since then he has spent his time persuading his friends and neighbors and others to donate money."To me, children's education is the most important. 5. I have to find sufficient funding before the school opens in September."

         When asked how long he will keep up his vital work as the community's guardian angel, he has a simple reply." Not until my eyes can't see, and my feet can't move."

A.They were having problems with their schoolwork

B.These are for the two girls he's going to visit this morning

C.They live in a small village not very far, though only one of the girls is still living at home

D.She displayed a talent for handwriting, writing her three-character name neatly and beautifully

E.The thought of students dropping out of school bothers me so much that I can't get to sleep at night

F.Of course, some people question why I would want to give up my retirement to go to so much trouble

G.He was so overcome by the tough situation of many poor children ?that he donated all his money to help out a girl

 

第二节(共5小题;每小题2分,共10分)

       根据短文内容,从短文后的选项中选出能填人空白处的最佳选项。选项中有两项为多余选项。

On a typical hot August day in Xianyou County, Fujian Province, Zeng Demei, a retired worker in his seventies, hurries down a busy street.In his hand is a black leather bag.Zeng opens his bag, taking out two forms.  71  

       Each of the forms contains detailed information of a student.On his arrival two hours later a woman greets him and leads him to her office where another man is waiting.They are the two village officials.They inspect the forms handed to them by Zeng and immediately recognize the girls. 72   ? "It’s a pity but it doesn't matter." says Zeng, who wastes no time in deciding to look for the remaining child, Su Qiuju.

       After half an hour, they stop outside a small house made of mud brick.A middle-aged man and a girl in a faded pink dress greet them.Su Qiuju is eight years old.She was forced to drop out of school after both her parents died.She is now living with her uncle who cannot afford his own children's education.However, the year of education Su Qiuju did complete was a successful one. 73  .

       When they are about to leave, Zeng says, "I must find a supporter for this girl to sponsor her education." Zeng has made it his retirement task to help children complete their schooling.Back in 1999, Zeng took part in a campaign started by the local women's organization to help students from poor families.  74  

       His task had begun and since then he has spent his time persuading his friends and neighbors and others to donate money."To me, children's education is the most important.  75    I have to find sufficient funding before the school opens in September."

       When asked how long he will keep up his vital work as the community's guardian angel, he has a simple reply." Not until my eyes can't see, and my feet can't move."

       A.They were having problems with their schoolwork

       B.These are for the two girls he's going to visit this morning

       C.They live in a small village not very far, though only one of the girls is still living at home

       D.She displayed a talent for handwriting, writing her three-character name neatly and beautifully

       E.The thought of students dropping out of school bothers me so much that I can't get to sleep at night

       F.Of course, some people question why I would want to give up my retirement to go to so much trouble

       G.He was so overcome by the tough situation of many poor children ?that he donated all his money to help out a girl

       根据短文内容,从短文后的选项中选出能填人空白处的最佳选项。选项中有两项为多余选项。

On a typical hot August day in Xianyou County, Fujian Province, Zeng Demei, a retired worker in his seventies, hurries down a busy street.In his hand is a black leather bag.Zeng opens his bag, taking out two forms.  71  

       Each of the forms contains detailed information of a student.On his arrival two hours later a woman greets him and leads him to her office where another man is waiting.They are the two village officials.They inspect the forms handed to them by Zeng and immediately recognize the girls. 72   ? "It’s a pity but it doesn't matter." says Zeng, who wastes no time in deciding to look for the remaining child, Su Qiuju.

       After half an hour, they stop outside a small house made of mud brick.A middle-aged man and a girl in a faded pink dress greet them.Su Qiuju is eight years old.She was forced to drop out of school after both her parents died.She is now living with her uncle who cannot afford his own children's education.However, the year of education Su Qiuju did complete was a successful one. 73  .

       When they are about to leave, Zeng says, "I must find a supporter for this girl to sponsor her education." Zeng has made it his retirement task to help children complete their schooling.Back in 1999, Zeng took part in a campaign started by the local women's organization to help students from poor families.  74  

       His task had begun and since then he has spent his time persuading his friends and neighbors and others to donate money."To me, children's education is the most important.  75    I have to find sufficient funding before the school opens in September."

       When asked how long he will keep up his vital work as the community's guardian angel, he has a simple reply." Not until my eyes can't see, and my feet can't move."

       A.They were having problems with their schoolwork

       B.These are for the two girls he's going to visit this morning

       C.They live in a small village not very far, though only one of the girls is still living at home

       D.She displayed a talent for handwriting, writing her three-character name neatly and beautifully

       E.The thought of students dropping out of school bothers me so much that I can't get to sleep at night

       F.Of course, some people question why I would want to give up my retirement to go to so much trouble

       G.He was so overcome by the tough situation of many poor children ?that he donated all his money to help

out a girl

On a typical hot August day in Xianyou County, Fujian Province, Zeng Demei, a retired worker in his seventies, hurries down a busy street.In his hand is a black leather bag.Zeng opens his bag, taking out two forms.    1_____.

Each of the forms contains detailed information of a student.On his arrival two hours later a woman greets him and leads him to her office where another man is waiting.They are the two village officials.They inspect the forms handed to them by Zeng and immediately recognize the girls.   2 _____ ? "It’s a pity but it doesn't matter." says Zeng, who wastes no time in deciding to look for the remaining child, Su Qiuju.

After half an hour, they stop outside a small house made of mud brick.A middle-aged man and a girl in a faded pink dress greet them.Su Qiuju is eight years old.She was forced to drop out of school after both her parents died.She is now living with her uncle who cannot afford his own children's education.However, the year of education Su Qiuju did complete was a successful one.   3 _____

When they are about to leave, Zeng says, "I must find a supporter for this girl to sponsor her education." Zeng has made it his retirement task to help children complete their schooling.Back in 1999, Zeng took part in a campaign started by the local women's organization to help students from poor families.   4 __________

His task had begun and since then he has spent his time persuading his friends and neighbors and others to donate money."To me, children's education is the most important.   5 _____ I have to find sufficient funding before the school opens in September."

When asked how long he will keep up his vital work as the community's guardian angel, he has a simple reply." Not until my eyes can't see, and my feet can't move."

A.They were having problems with their schoolwork

B.These are for the two girls he's going to visit this morning

C.They live in a small village not very far, though only one of the girls is still living at home

D.She displayed a talent for handwriting, writing her three-character name neatly and beautifully

E.The thought of students dropping out of school bothers me so much that I can't get to sleep at night

F.Of course, some people question why I would want to give up my retirement to go to so much trouble

G.He was so overcome by the tough situation of many poor children that he donated all his money to help out a girl

 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网