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题型:阅读理解-阅读单选 难度:0.85 引用次数:929 题号:327713

Your Genes, Your Future

How would you feel if someone gave you an envelope with a description of every one of your genes? Supposing this information could tell you what illnesses you were likely to get, or even what illness you might die of, would you open the envelope?

It's a difficult question to answer. But the fact is that scientists have already begun to discover how certain genes influence us. And in the next decade, they will learn a lot more.

We have known for a long time that many of our physical characteristics are inherited(继承). For example, our eye colour and certain diseases are decided by our genes. As long as you have a good diet, scientists can predict your height by looking at your parents' heights. And we now know that the need to wear glasses has a genetic cause. Our eating habits also appear to be decided by our genes!

With other characteristics, things are not so clear. Certainly, scientists have now shown that some traits(特性,特质) are strongly influenced by our genes. Do you prefer getting up early or late? To a great extent, it's your genes that decide. Do you enjoy dangerous sports such as car racing? There is a gene that influences how much excitement we need.

But with most psychological characteristics, scientists are learning that both our genes and our environment affect us. This is true of things such as how violent we are, and how well we get on with other people. So, even though scientists may soon be able to describe our genes in detail, it does not mean they will be able to predict our future with any real success.

Nevertheless, the fact is that scientists will be able to "read" our genes in the near future. This will create new problems. To give a few examples, insurance companies may not want to insure people whose genes predict certain illnesses. Employers may not want to employ people who have a gene for violence. One thing is already clear -- with these new developments, life is going to become even more complicated!

1. Which characteristics is mostly likely to be inherited?
A.Eye color.B.Interest.
C.Future.D.Ability.
2. What kind of problem will these new developments create?
A.You may die of a certain illness described in the envelope.
B.There will be an increased number of violent people.
C.People may take part in dangerous sports such as car racing.
D.Insurance companies may refuse to insure people with a gene for certain disease.
3. Why won’t scientists be able to tell us a lot about our future?
A.Because we’re affected not only by our genes but also by our environment.
B.Because scientists will not be able to read our genes in the near future.
C.Because life in the future will be more complicated.
D.Because scientists can’t describe our genes in detail.
【知识点】 科普知识 说明文

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John Price and other researchers studied two groups of mice. One group was able to eat as much as it wanted. The researchers limited what the mice in the other group ate. Their diet had 35 percent fewer calories than the first group of mice.

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The researchers say ribosomes use from 10 to 20 percent of the cell’s energy to make those proteins. Price wrote that because of this, it is impractical to destroy an entire ribosome when it starts to break down. However, repairing individual parts of the ribosome on a regular basis enables ribosomes to continue producing high quality proteins for longer than they would otherwise. This top quality production, in turn, keeps cells and the entire body functioning well.

Price said, “ribosome is a very complex machine, like a car.” “They need maintenance to replace the parts that wear out the fastest. When tires wear out,” he explained,” you don’t throw the whole car away and buy a new one. It costs less to replace the old tires.”

“Food,” he said, “isn’t just material to be burned—it’s a signal that tells our body and cells how to respond.” Price said the findings help to explain how exactly our bodies age. And this may “help us make more educated decisions about what we eat.”

1. What can we know about the mice with limited calories from the study?
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3. Price explained the ribosomes’ role of repairing themselves by _________.
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A.Food decides how long you live.
B.Can you slow down your aging process?
C.Eating less may help you live longer.
D.Should your diet be reduced for your health?
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【推荐2】If you’ re a sports fan, you may be familiar with the emotional rollercoaster that comes with sports audience. Whether you’ re part of a buzzing crowd in a stadium, or just watching at home on TV, it’s easy to get caught up in the highs and the lows when you celebrate or commiserate with your favourite team or athlete.

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A.Short-term memories can be affected by preconceptions.
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