The order of gene transfer is not the same for different Hfr strains.

According to the passage, scientists examine the genomes of astronauts in order to

A．select suitable astronauts for the space flight.

B．design countermeasures against gene mutation.

C．detect and cure the deficiencies in their genes.

D．prepare personalized gene-based medicine.

27 Cancer occurs when cells in the body divide without .

28 Gene alterations may be caused by .

29 Treatment for cancer may also bring about some .

30 Cancer patients may differ in their .

A prescription medicines

B control or order

C tolerance for pain

D various factors

E different genes

F side effects

A、It initiates the X inactivation process in females.

B、It is located on the X chromosome and causes the X to pair with the Y chromosome during male meiosis.

C、It is located on the Y chromosome and initiates the developmental pathway toward the male phenotype.

D、It is located on an autosomal chromosome and represses expression of autosomal genes in order to balance their expression level with genes on the X chromosome.

According to Dr. Collins, how to prevent those patents？

A．To stop clinical lab from doing diagnostic testing.

B．To order government labs to make every new gene discovery public knowledge.

C．To pass laws prohibiting private ownership of genome patents.

From this passage, we can learn that______.

A．you can read an ebook on a laptop when you travel

B．you can order an ebook using the Ebook Reader

C．the ebooks ordered have to be shipped to you

D．it takes a lot of trouble reading an ebook

(偶然的，碰运气的) affair. Not anymore. Parents who have access to the latest genetic testing techniques can now predetermine their baby's sex with great accuracy, as Monique and Scott Collins learned to their delight two years ago, when their long-wished-for daughter Jessica was born after genetic prescreening at a fertility clinic in Fairfax, Virginia.

And baby Jessica is just the beginning. Within a decade or two, it may be possible to screen kids almost before pregnancy for an enormous range of attributes, such as how tall they're likely to be, what body type they will have, their hair and eye color, and even, conceivably, their IQ and personality type.

In fact, if gene therapy lives up to its promise, parents may someday be able to go beyond weeding out undesirable traits and start actually inserting the genes they want, perhaps even genes that have been crafted in a lab. Before the new millennium, parents may be going to fertility clinics and picking from a list of options the way car buyers order air conditioning and chrome-alloy wheels. "It's the ultimate shopping experience: designing your baby," says biotechnology critic Jeremy Rifkin, who is appalled by the prospect. "In a society which is using to cosmetic surgery, this is not a big step."

The prospect of designer babies, like many of the ethical problems posed by the genetic revolution, is confronting the world so rapidly that doctors, ethicists, religious leaders and politicians are just starting to grapple (格斗) with the implications, and trying to decide how they feel about it all.

They still have a bit of time. Aside from gender, the only traits that can now be identified at the earliest stages of development are about a dozen of the most serious genetic diseases. Gene therapy in embryos (胚胎) is at least a few years away. And the gene or combination of genes responsible for most of our physical and mental attributes hasn't even been identified yet, making moot (无实际意义的) the idea of engineering genes in or out of a fetus (胎儿).

What is gene therapy supposed to do to live up to its promise？

A．Screen a baby for sex.

B．Remove undesirable attributes.

C．Implant genes.

D．Identify genetic disorder.

根据内容回答题。

Congratulations, It Will Be A Boy!

Until just a few years ago, making a baby boy or a girl was pretty much a hit-or-miss affair.

Not anymore. Parents who have access to the latest genetic testing techniques can now predetermine theirbaby&39;s sex with great accuracy, as Monique and Scott Collins learned to their delight two years ago, when their long-wished-for daughter Jessica was born after genetic prescreening(基因筛选)

And baby Jessica is just the begining. Within a decade or two, it may be possible to screen kids almost before conception (怀孕) for an enormous range of attributes (特性), such as how tall they are likely to be, what body type they will have, their hair and eye color, what sort of ill- ness they will be naturally resistant to, and even. conceivably(可想见地) , their IQ and person- ality type.

In fact, if gene therapy lives up to, its promise, parents may someday be able to go beyond weeding out(筛去) undesirable traits and start actually inserting the genes they want perhaps even genes that have been crafted(创造) in a lab. Before the new millennium is many years old, parents may be going to fertility clinics(生殖诊所) and picking from a list of options the way car buyers order air conditioning and chrome-alloy(铪合金) wheels. "It is the ultimate shopping experience: designing your baby," says biotechnology critic Jeremy Rifkin, who is appalled by the prospect. "But in a society used to cosmetic surgery(整容手术), this is not a big step. "

The prospect of designer(定制) babies, like many of the ethnical conundrums(~)posed by the genetic revolution, is confronting the world so rapidly that doctors, ethicists (伦理学家),religious leaders and politicians are just starting to grapple with (与......进行格斗) the implications and trying to decide how they feel about it all.

They still have a bit of time. Aside from gender, the only traits they can now be identified at the earliest stages of development are about a dozen of the most serious genetic diseases. Gene therapy in embryos (胚胎) is at least a few years away. And the gene or combination of genes responsible for most of our physical and mental attributes has not even been identified yet. Besides, say clinicians, even if the techniques for making designer babies are perfected within the next decade, they should be applied in the service Of disease prevention, not improving on nature.

What is gene therapy supposed to do if it lives up to its promise？ 查看材料

A.Screen a baby for sex.

B.Predetermine a baby"s sex.

C.Insert genes.

D.Identify genetic disorders.

根据材料请回答 31～35

Congratulations, It Will Be A Boy!

Until just a few years ago, making a baby boy or a girl was pretty much a hit-or-miss affair.Not anymore.Parents who have access to the latest genetic testing techniques can now predetermine their baby's sex with great accuracy, as Monique and Scott Collins learned to their delight two years ago, when their long-wished-for daughter Jessica was born after genetic prescreening(基因筛选).

And baby Jessica is just the beginning.Within a decade or two, it may be possible to screen kids almost before conception (怀孕) for an enormous range of attributes (特性), such as how tall they are likely to be, what body type they：will have, their hair and eye color, what .sort of illness they will be naturally resistant to, and even, conceivably(可想见地), their IQ and personality type.

In fact, if gene therapy lives up to its promise, parents may someday be able to go be-yond weeding out(筛去) undesirable traits and start actually inserting the genes they want-- perhaps even genes that have been crafted(创造) in a lab.Before the new millennium is many years old, parents may be going to fertility clinics(生殖诊所) and picking from a list of options the way car buyers order air conditioning and chrome-alloy(铬合金) wheels."It is the ultimate shopping experience: designing your baby," says biotechnology critic Jere - my Rifkin, who is appalled by the prospect."But in a society used to cosmetic surgery(整容手术), this is not a big step."

The prospect of designer(定制) babies, like many of the ethnical conundrums(难题)posed by the genetic revolution, is confronting the world so rapidly that doctors, ethicists (伦理学家), religious leaders and politicians are just starting to grapple with(与……进行格斗) the implications -- and trying to decide how they feel about it all.

They still have a bit of time.Aside from gender, the only traits they can now be iden-tified at the earliest stages of development are about a dozen of the most serious genetic diseases.Gene therapy in embryos(胚胎) is at least a few years away.And the gene or combination of genes responsible for most of our physical and mental attributes has not e-ven been identified yet.Besides, say clinicians, even if the techniques for making designer babies are perfected within the next decade, they should be applied in the service of disease prevention, not improving on nature.

第 31 题 What is gene therapy supposed to do if it lives up to its promise？

A．Screen a baby for sex.

B．Predetermine a baby's sex.

C．Insert genes.

D．Identify genetic disorders.