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第二篇
Are These Food Safe to Eat?
Traditionally,in plant breeding,there are crossing varieties of the same species in ways they could cross naturally.For example,disease-resistant varieties of wheat have been crossed with highyield wheat to combine these properties.This type of natural gene exchange is safe and fairly predictable.
Genetic engineering(GE)makes it possible to exchange genes between unrelated species that cannot exchange genes with each other in a natural way.GE can involve the exchange of genes be-tween vastly different species一e.g. putting scorpion toxin genes into maize or fish antifreeze genes into tomatoes.It is possible that a scorpion toxin gene,even when it is in maize DNA,will still get the organism to produce scorpion toxin一but what other effects may it have in this alien environment? We have already realized this problem一adding human growth hormone genes to pigs certainly makes them grow一but it also gives them arthritis and makes them cross-eyed,which was entirely out of expectation.
It won't be difficult to find out,for example,that the gene for human intelligence will not have the same effect if it is inserted into cabbage DNA as it had in human DNA一but what side-effect would it have?In other words,is genetically modified(GM)food safe to eat?The answer is that no-body knows because long-term tests have not been carried out.
Those companies who want a GM product approved in the UK or USA are required to provide regulatory bodies with results of their own safety tests.Monsanto's soya beans were apparently fed to fish for 10 weeks before being approved.There was no requirement for independent testing,for longterm testing,for testing on humans or testing for specific dangers to children or allergic people.
The present opinion of the British Government is that"There is no evidence of long-term dangers from GM foods."In the US,the American Food and Drug Administration is now being prosecuted for covering up research that suggested possible risks from GM foods.
Which statement about GM product is true according to the passage?
A:Adding human growth hormone genes to pigs does not make them grow.
B:The American Food and Drug Administration is now doing a research that suggested possible risks from GM foods.
C:The gene for human intelligence will not have the same effect if it is inserted into cabbage DNA as it had in human DNA.
D: There has been requirement for independent testing,for long-term testing,for testing on humans or testing for specific dangers to children or allergic people.
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A Special Journey
I am often asked to describe the experience of_______(51)a child with a disability一to try to help people who have not shared that unique experience to understand it,to imagine how it would feel.It's like this…
_______(52)you're going to have a baby,it's like planning a fabulous vacation trip to Italy. You buy a bunch of guide books and make your wonderful_______(53).The Coliseum,the Michelangelo,David,the gondolas in Venice.You may learn some handy phrases in Italian. It's all very exciting.
After months of eager anticipation,the day finally_______(54).You pack your bags and _______(55)you go.Several hours later,the plane lands.The_______(56)comes in and says,"Welcome to Holland."
"Holland?"you say."What do you mean by Holland?I signed up for Italy!I'm supposed to be in Italy. All my life I've dreamed_______(57)going to Italy."
But there's been a change in the flight plan.They've landed in Holland and there you must stay.
The important thing is that they haven't taken you to a horrible,disgusting,filthy place,full of pestilence,_______(58)and disease.It's just a_______(59)place.
_______(60)you must go out and buy new guide books.And you must learn a whole new language.And you will meet a whole new group of people you would never have met.
It's just a different place.It's slower-paced than Italy,less flashy than Italy. But after you've been there for a while and you catch your breath,you look around…and you begin to_______ (61)that Holland has windmills…and Holland has tulips.Holland even has Rembrandts.
But everyone you know is busy coming and going_______(62)Italy…and they're all bragging about_______(63)a wonderful time they had there. And for the rest of your life,you will say"Yes,that's where I was_______(64)to go.That's what I had planned."
But if you spend your life_______(65)the fact that you didn't get to Italy,you may never be free to enjoy the very special,the very lovely things about Holland.
_________(62)
A:to
B:into
C:for
D:from
A Special Journey
I am often asked to describe the experience of_______(51)a child with a disability一to try to help people who have not shared that unique experience to understand it,to imagine how it would feel.It's like this…
_______(52)you're going to have a baby,it's like planning a fabulous vacation trip to Italy. You buy a bunch of guide books and make your wonderful_______(53).The Coliseum,the Michelangelo,David,the gondolas in Venice.You may learn some handy phrases in Italian. It's all very exciting.
After months of eager anticipation,the day finally_______(54).You pack your bags and _______(55)you go.Several hours later,the plane lands.The_______(56)comes in and says,"Welcome to Holland."
"Holland?"you say."What do you mean by Holland?I signed up for Italy!I'm supposed to be in Italy. All my life I've dreamed_______(57)going to Italy."
But there's been a change in the flight plan.They've landed in Holland and there you must stay.
The important thing is that they haven't taken you to a horrible,disgusting,filthy place,full of pestilence,_______(58)and disease.It's just a_______(59)place.
_______(60)you must go out and buy new guide books.And you must learn a whole new language.And you will meet a whole new group of people you would never have met.
It's just a different place.It's slower-paced than Italy,less flashy than Italy. But after you've been there for a while and you catch your breath,you look around…and you begin to_______ (61)that Holland has windmills…and Holland has tulips.Holland even has Rembrandts.
But everyone you know is busy coming and going_______(62)Italy…and they're all bragging about_______(63)a wonderful time they had there. And for the rest of your life,you will say"Yes,that's where I was_______(64)to go.That's what I had planned."
But if you spend your life_______(65)the fact that you didn't get to Italy,you may never be free to enjoy the very special,the very lovely things about Holland.
_________(62)
A:to
B:into
C:for
D:from
共用题干
第三篇
Cell Phones : Hang Up or Keep Talking?
Millions of people are using cell phones today.In many places it is actually considered unusual not to
use one.In many countries,cell phones are very popular with young people.They find that the phones are
more than a means of communication一having a mobile phone shows that they are cool and connected.
The explosions around the world in mobile phone use make some health professionals worried.Some
doctors are concerned that in the future many people may suffer health problems from the use of mobile
phones.In England,there has been a serious debate about this issue.Mobile phone companies are worried
about the negative publicity of such ideas.They say that there is no proof that mobile phones are bad for your
health.
On the other hand,why do some medical studies show changes in the brain cells of some people who use
mobile phones?Signs of change in the tissues of the brain and head can be detected with modern scanning
（扫描）equipment. In one case , a traveling salesman had to retire at a young age because of serious memory
Loss.He couldn't remember even simple tasks.He would often forget the name of his own son.This man used
to talk on his mobile phone for about six hours a day,every day of his working week,for a couple of years.
His family doctor blamed his mobile phone use,but his employer's doctor didn't agree.
What is it that makes mobile phones potentially harmful?The answer is radiation.High-tech machines
can detect very small amounts of radiation from mobile phones.Mobile phone companies agree that there is
some radiation,but they say the amount is too small to worry about.
As the discussion about their safety continues,it appears that it's best to use mobile phones less often.
Use your regular phone if you want to talk for a long time.Use your mobile phone only when you really need
it.Mobile phones can be very useful and convenient,especially in emergencies.In the future,mobile phones
may have a warning label that says they are bad for your health.So for now,it's wise not to use your mobile
phone too often.
People buy cell phones for the following reasons EXCEPT that__________.
A:they're convenient
B:they're useful
C:they're popular
D:they're cheap
第三篇
Cell Phones : Hang Up or Keep Talking?
Millions of people are using cell phones today.In many places it is actually considered unusual not to
use one.In many countries,cell phones are very popular with young people.They find that the phones are
more than a means of communication一having a mobile phone shows that they are cool and connected.
The explosions around the world in mobile phone use make some health professionals worried.Some
doctors are concerned that in the future many people may suffer health problems from the use of mobile
phones.In England,there has been a serious debate about this issue.Mobile phone companies are worried
about the negative publicity of such ideas.They say that there is no proof that mobile phones are bad for your
health.
On the other hand,why do some medical studies show changes in the brain cells of some people who use
mobile phones?Signs of change in the tissues of the brain and head can be detected with modern scanning
（扫描）equipment. In one case , a traveling salesman had to retire at a young age because of serious memory
Loss.He couldn't remember even simple tasks.He would often forget the name of his own son.This man used
to talk on his mobile phone for about six hours a day,every day of his working week,for a couple of years.
His family doctor blamed his mobile phone use,but his employer's doctor didn't agree.
What is it that makes mobile phones potentially harmful?The answer is radiation.High-tech machines
can detect very small amounts of radiation from mobile phones.Mobile phone companies agree that there is
some radiation,but they say the amount is too small to worry about.
As the discussion about their safety continues,it appears that it's best to use mobile phones less often.
Use your regular phone if you want to talk for a long time.Use your mobile phone only when you really need
it.Mobile phones can be very useful and convenient,especially in emergencies.In the future,mobile phones
may have a warning label that says they are bad for your health.So for now,it's wise not to use your mobile
phone too often.
People buy cell phones for the following reasons EXCEPT that__________.
A:they're convenient
B:they're useful
C:they're popular
D:they're cheap
You have to be patient if you want to sustain your position.
A:maintain
B:establish
C:acquire
D:support
A:maintain
B:establish
C:acquire
D:support
She was one of theleadingwriters in her age.
A: successful
B: major
C: outstanding
D: musical
A: successful
B: major
C: outstanding
D: musical
共用题干
Young Adults Who Exercise Get Higher IQ Scores
Young adults who are fit have a higher IQ and are more likely to go on to university,reveals a major new
study_________(51)out at the Sahlgrenska Academy and Sahlgrenska University Hospital.
The results were recently published in the Proceedings of the National Academy of Sciences(PNAS).The
study__________(52)1._________(1.)
2 million Swedish men doing military service who were born between 1950 and
1976._________(1976.)
The research group analyzed the ________(53)of both physical and IQ tests the youngsters took
right after they started serving the army.
The study shows a clear link _________(54)good physical fitness and better results for the IQ test.
The strongest links are for ________(55)thinking and verbal comprehension.But it is only fitness that
plays a _________ (56)in the results for the IQ test,and not strength."Being fit means that you also have
good heart and lung __________(57)and that your brain gets plenty of oxygen."says Michael Nilsson,pro-
fessor at the Sahlgrenska Academy and chief physician at the Sahlgrenska University Hospital."This may be
one of the reasons why we can see a clear link with fitness,but not with muscular_________(58).We are
also seeing that there are growth factors that are important."
By analyzing data for twins,the researchers have been________(59)to determine that it is primarily
environmental factors and not genes that___________(60)the link between fitness and a higher IQ.
"We have also shown that those youngsters who _______(61)their physical fitness between the ages
of 1 5 and 1 8 increase their performance."says Maria Aberg,researcher at the Sahlgrenska Academy and
physician at Aby health centre."This being the case,physical education is a_______(62)that has an
important place in schools,and is an absolute must________(63)we want to do well in math and other
theoretical subjects."
The researchers have also compared the results from fitness tests during national service_______(64)
the socioeconomic status of the men later in life.Those who were fit at I 8 were more__________(65)to go
into higher education,and many secured more qualified jobs.
_________(62)
A:rule
B:test
C: subject
D:score
Young Adults Who Exercise Get Higher IQ Scores
Young adults who are fit have a higher IQ and are more likely to go on to university,reveals a major new
study_________(51)out at the Sahlgrenska Academy and Sahlgrenska University Hospital.
The results were recently published in the Proceedings of the National Academy of Sciences(PNAS).The
study__________(52)1._________(1.)
2 million Swedish men doing military service who were born between 1950 and
1976._________(1976.)
The research group analyzed the ________(53)of both physical and IQ tests the youngsters took
right after they started serving the army.
The study shows a clear link _________(54)good physical fitness and better results for the IQ test.
The strongest links are for ________(55)thinking and verbal comprehension.But it is only fitness that
plays a _________ (56)in the results for the IQ test,and not strength."Being fit means that you also have
good heart and lung __________(57)and that your brain gets plenty of oxygen."says Michael Nilsson,pro-
fessor at the Sahlgrenska Academy and chief physician at the Sahlgrenska University Hospital."This may be
one of the reasons why we can see a clear link with fitness,but not with muscular_________(58).We are
also seeing that there are growth factors that are important."
By analyzing data for twins,the researchers have been________(59)to determine that it is primarily
environmental factors and not genes that___________(60)the link between fitness and a higher IQ.
"We have also shown that those youngsters who _______(61)their physical fitness between the ages
of 1 5 and 1 8 increase their performance."says Maria Aberg,researcher at the Sahlgrenska Academy and
physician at Aby health centre."This being the case,physical education is a_______(62)that has an
important place in schools,and is an absolute must________(63)we want to do well in math and other
theoretical subjects."
The researchers have also compared the results from fitness tests during national service_______(64)
the socioeconomic status of the men later in life.Those who were fit at I 8 were more__________(65)to go
into higher education,and many secured more qualified jobs.
_________(62)
A:rule
B:test
C: subject
D:score