高一英语阅读理解专项练习10
Week Sixteen 科普小品
一、阅读理解（共20小题；共40.0分）
A
Is the univer getting darker? One group of scientists believes so. Their rearch suggests the birthrate of stars has declined(下降) over the past few billion years.
In the largest study of its kind, astronomers ud special telescopes to survey star-forming galaxies. They looked at the light, gas, and dust from stars to e how fast they form and how their conditions change over time. They found that star production has been declining over the past 9 billion years.
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Stars are bright balls of hot gas held together by gravity. They form when clouds of dust and gas in the univer become unstable and fall down under their own gravity. The center of thi
s material becomes den and hot, causing a nuclear reaction. When that happens, the cloud begins to shine as a star.
Rearch suggests that star formation began around 13.4 billion years ago. But it was the period between 11 billion and 9 billion years ago that star production really boomed, producing roughly half the stars in the univer. Now, star formation is at only one-thirtieth of that rate.
You might say that the univer has been losing lights for a long time. Cosmic output is now only 3 percent of what it ud to be at the peak of star production, says David Sobral, a rearcher from the Institute for Astronomy, University of Edinburgh, UK.
六级成绩If star production continues declining as it has, astronomers guess that only 5 percent more stars will form over the remaining history of the univer.
That doesn't mean the sky will turn dark anytime soon. The life of a single star can last billions of years. But it does mean that fewer stars are forming now than when the univer was younger.
知识改变命运
"While the measurements provide a sharp picture of the decline of star formation in the univer," says Philip Best of the Institute for Astronomy, "they also provide perfect samples to show the even more basic mystery which we are continuing to work to solve: Why?"
1. Studying star formation, scientists don't mainly rearch .
A. the star's distancetycoon
B. the star's light
C. the star's dust
D. the star's gas
2. The third paragraph mainly discuss .
A. the power of gravity
B. the cour of forming stars
C. the materials in the univer
D. the effect of dust in the sky
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3. Stars in the sky were formed mainly .北京新东方网站
A. before 13.4 billion years
B. during 13.4 billion-9 billion years
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C. during 11 billion-9 billion years
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D. after 9 billion years
4. The last paragraph implies that scientists will rearch .
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A. why the univer begins to become brighter
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B. why the univer has a shorter remaining history
C. why the sky turns dark at night
D. why fewer stars are formed at prent
5. The passage mainly tells us that .
知识改变命运
A. the birth of new stars has greatly declined
B. the univer has a limited history
晚会唱什么歌好C. the sky is becoming darker and darker
D. the star will disappear in the univer
B
Would you wear clothing made from food products or jewelry made of human hair? Some people would. Ask German fashion designer Anke Domaske, who clothes made from
milk are becoming popular. Milk fabric has been around since the 1930s, but at that time, the milk was combined with chemicals. Domaske's fabric. QMilch, is the first man-made fiber made without chemicals. She developed it by removing a milk protein from dry milk.
She then heated it and spun it into yarn. It takes about six liters of milk to produce one dress. According to Domaske, the fabric feels like silk, doesn't smell and can be washed.
Would you prefer bedtime slippers made of bread? Twin brothers and designers R & E Prasaliauskas have created a unique slipper made completely of bread. The slippers can be ordered in white, gold, and black. They also have styles for both adults and kids. And yes, the bread slippers can be eaten if you get hungry for a late-night snack.
What do you do with your empty instant noodle packages? One young woman came up with a creative solution-she made a dress! With 196 packages and a few chopsticks, Karina from Virginia created a winning project called "wearable art".
Jewelry made of human hair may sound strange to us today. But it was once a very popul
ar item. During the 1600s, bracelets made with human hair were given as signs of affection. Britain's Queen Victoria gave gifts of jewelry made of her own hair.
