题目内容
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Only after a baby seal is pushed into the sea by its mother ______ how to swim.
A．will it learn
B．it will learn
C．has it learned
D．it has learned
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听力原文： For centuries, parrots have been prized pets because of their strange talent for imitating human speech. They are able to hear vocal ranges, memorize the tones, and then repeat what they have heard. Often this skill is used to entertain people. But recently, an Amazon parrot, named Baby, was able to put this ability to work by helping police break up a gang of burglars responsible for over＄ 50,000 in property theft.
Baby helped the police to identify the gang of thieves. A recent robbery victim reported to the Baytown, Texas police that her parrot, Baby started acting strangely and saying new phrases after the robbery. Before the robbery, Baby had only a twenty-eight word vocabulary; afterwards, the bird started saying the additional phrases "Come back, Robert!" and "Come on, Ronnie!".
The police detectives were delighted. Although one man had already been arrested, Ronnie and Robert were the names of their two top suspects who were believed to have aided the first man. Under questioning, this suspect explained what had happened. When the robbers entered the house, they heard Baby talking and thought that someone was home. Ronnie and Robert began running away, while the third man yelled for them to come back. Baby remembered this incident and recorded their voices in her memory.
(33)
A．A victim.
B．A police detective.
C．A robber.
D．A pet bird.
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.
According to the passage, when did Canada's baby boom begin？
A．In the decade after 1911.
B．After 1945.
C．During the depression of the 1930s.
D．In 1966.
In the recent three years, Denise Egebrecht has been busy______.
A．looking after her sick baby daughter
B．helping her husband with the housework
C．taking care of her sick elderly mother
D．looking for a better job to support the family
It is true that Americans do not typically plan their births to set an example for developing nations. We are more affected by women's liberation: once women see interesting and well-paid jobs and careers available, they are less willing to' provide free labor for child raising. From costing nothing, children suddenly come to seem impossibly expensive. And to the high cost of children are added the uncertainties introduced by divorce, couples are increasingly unwilling to subject children to the terrible experience of marrital breakdown and themselves to the difficulty of raising a child alone.
These circumstances - women working outside the home and the instability of marriage - tend to spread with industrial society and they will affect more and more countries during the remainder of this century. Along with them goes social mobility, ambition to rise in the urban world, a main factor in bringing down the births in Europe in the nineteenth Century.
Food shortage will happen again when the reserves resulting from the good harvests of 1976 and 1977 have been consumed. Urbanization is likely to continue with the cities of the developing nations struggling under the weight of twice their present populations by the year 2000. The presently rich countries are approaching a stable population largely because of the changed place of women, and they incidentally arc setting an example of restraint to the rest of the world. Industrail society will spread to the poor countries and aspirations will exceed resources. All this leads to a population in the twentyfirst century that is smaller than was feared a few years ago. For those anxious to see world population brought under control the news is encouraging.
During the years from 1957 to 1976, the birth rate of the United States ______.
A．increased
B．experienced both falls and rises
C．was reduced
D．remained stable
A．The man is not going to have a second baby.
B．The man might stay at home more and more.
C．The baby girl takes after the man in the appearance.
D．The man's colleagues have bought something as gifts.
What can we conclude from the end of the conversation？
A．Smoking is the only bad habit the man should change.
B．She doesn't love the man as deep as before.
C．She doesn't want to have a baby if the man smokes.
D．Maybe she will leave the man if he continues to smoke.
