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题型:阅读理解 题类:常考题 难易度:普通

人教版(2019)高中英语2020-2021学年必修三Unit 4课时素养评价1

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An international team of scientists has discovered a stellar black hole in Earth's "cosmic backyard" containing the mass of 70 suns.

It's a black hole that forms after stars die, collapse, and explode. Researchers had long believed that the size limit was only 20 times the mass of our sun because as these stars die, they lose most of their mass through explosions that force matter and gas swept away by stellar winds.

This theory has now been toppled by LB-1, the newly discovered black hole. Located about 15, 000 light years away, it has a mass 70 times greater than our sun, according to a press release from the Chinese Academy of Sciences.

"Black holes of such mass should not even exist in our galaxy (星系), according to most of the present models of stellar evolution, " said Liu Jifeng, head of the team that made the discovery.

"LB-1 is twice as massive as what we thought possible. Now theorists will have to take up the challenge of explaining its formation. "

Scientists are now scratching their heads at how LB-1 got so huge.

The team has proposed some theories. LB-1's sheer size suggests that it "was not formed from the collapse of only one star," the study said — instead, it could potentially be two smaller black holes orbiting each other.

Another possibility is that it formed from" fallback supernova (超新星)". This is when a supernova — the last stage of an exploding star — ejects (喷射) material during the explosion, which then falls back into the supernova, creating a black hole. This fallback formation is theoretically possible, but scientists have never been able to prove or observe it.

There are several types of black holes and stellar black holes like LB-1 are on the smaller side, according to NASA. Supermassive black holes are much bigger — they can be billions of times the mass of our sun.

Scientists believe supermassive black holes may have connection with the formation of galaxies, as they often exist at the center of the mass star stems but it is still not clear exactly how, or which form first.

(1)、According to scientists, what might account for the formation of LB-1?
A、The material ejected in the explosion of a supernova. B、The smaller black holes moving around each other. C、The evolution of the solar system. D、The collapse of a certain star.
(2)、What does the word "toppled" in Paragraph 3 probably mean?
A、Confirmed. B、Strengthened. C、Overturned. D、Refused.
(3)、What is the purpose of writing this article?
A、To inform readers of the basic knowledge about black holes. B、To share the recent development of the black hole discovery. C、To show the importance of discovering black holes for science. D、To report achievements scientists have made in black hole theory.
(4)、What might be the best title for the passage?
A、The Latest Discovery of Galaxies B、Proposed Theories of Black Holes C、The Possible Formation of the Black Holes D、Biggest Stellar-mass Black Hole Discovered
举一反三
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    The UN refugee agency (难民署) is heaping pressure on Europe to help Italy defuse (平息) the “unfolding tragedy” of tens of thousands of migrants flooding its shores. Italy needs more international support to deal with a growing number of migrants who have braved a risky Mediterranean crossing to reach Europe this year, UN High Commissioner for Refugees Filippo Grandi said on Saturday.

     “What is happening in front of our eyes in Italy is an unfolding tragedy,” Grandi said in a statement. “In the course of last weekend, 12,600 migrants and refugees arrived on its shores, and an estimated 2,030 have lost their lives in the Mediterranean since the beginning of the year.” Italy, he said, was “playing its part” in taking in those rescued and offering protection to those in need. “These efforts must be continued and strengthened. But this cannot be an Italian problem alone.”

    Separately, a source in Paris said the interior ministers of France, Germany and Italy would meet in the French capital on Sunday to discuss an approach to help Rome.

    Violence in Calais

    Europe has been dealing with the worst migration crisis since the end of World War II with the arrival of large numbers of people fleeing the wars in Syria and Iraq while others from Africa are seeking an escape from poverty or political persecution (迫害).

    In the northern French port city of Calais, police stepped in over the past two days to break up fighting among African migrants armed with sticks and rocks. Calais has for years been a magnet (磁铁) for migrants and refugees hoping to cross the Channel to Britain.

    Last October, France broke up the disreputable tent camp known as “the Jungle” transferring thousands of migrants to centers around the country. But hundreds remain near the port, mostly Africans and Afghans, who fight sporadically with police as they make nightly attempts to stow away (偷乘) onto trucks heading across the Channel to Britain.

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    Please send a CV(简历), recent photograph, and covering letter to us.

    B. Open Skies

A leading adventure holiday company is looking for guides and instructors for a number of outdoor activities. We need physically healthy and strong people who enjoy being with other people —good team workers with an interest in cycling, riding, water sports, mountain sports and other adventure activities. One will have a better chance of getting this job if he or she has experience and suitable qualifications.

    C. Come and see the world!

    Recently-formed airline company requires flight attendants. These people are going to serve passengers from different countries on our plane. So we want our staff to be of smart appearance, polite and able to communicate in three or more languages. Starting salary depends on experience.

    D. Volunteer needed

    Daily work includes teaching English, art, maths, etc…, as well as leading educational play groups. Support will be given by local teachers or project staff?

    Volunteers should be available to start work next month. No qualifications required, but people interested in this job should be outgoing and be good with young children.

    Please send a CV and a short introduction of yourself.

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    China became the first country to clone a monkey using non-reproductive cells, scientists said on Thursday. By December 2017 , the Chinese Academy of Sciences had created two clone macaques(猕猴) named“Zhong Zhong” and “Hua Hua”by nuclear transferring of body cells—any cell in the organism other than reproductive cells. This was the similar technology used to create the famous clone sheep Dolly in 1996.

    Telra, a monkey born in 1999 , is the world's first ever-cloned monkey, but it was done using a simpler method called embryo splitting(胚胎分裂),and cannot be genetically modified to suit experimental needs, said Pu Muming, a leading researcher at the Chinese Academy of Sciences. Cloning a monkey using body cells has been a world-class challenge because it is a primate(灵长类)that shares its genetic makeup, therefore all of its complexity, with humans, he said.

    For drug and other lab tests, scientists have to purchase monkeys from all over the world, which is costly, bad for the environment and produces inaccurate results because each monkey might have different genes, Pu said.

    By cloning monkey using body cells, we can mass reproduce a large number of genetically identical monkeys in a short amount of time, and we can even change their genes to suit our needs, he added. “This can save time, cut down experiment costs, and produce more accurate results, leading to more effective medicine.”

    Sun Qiang, director of the non-human primate research facility at the institute, said most of the drug trials are currently done on lab mice. However, drugs that work on mice might not work or even have severe side effects on humans because the two species are so different.

    Monkeys and humans are both primates, so they are much closely related and testing on monkeys is supposed to be as effective as testing on humans. This achievement will help China lead the world research in an international science project related to study of primate brains.

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    Physics is a different world now. Will there ever be another Einstein?

    Scientists say a new Einstein will appear, but it may take a long time. After all, more than 200 years separated Einstein from his nearest rival (对手) , Isaac Newton. Many physicists say the next Einstein hasn't been born yet, or is only a baby now. That's because the searching for a unified(统一的) theory that would explain all the forces of nature has pushed current mathematics to its limits. New math must be created before the problem can be solved.

    But researchers say there are many other factors working against another Einstein appearing anytime soon. For one thing, physics is quite a different field today. In Einstein's day, there were a few thousand physicists worldwide, and fewer theoreticians. Education is different, too. One extremely important aspect of Einstein's training that failed to be considered is the philosophy he read as a teenager. It taught him how to think theoretically about space and time.

    And he was a skilled musician. The interplay between music and math is well known. Einstein would fiercely play his violin as a way to think through a knotty physics problem.

    Today, universities have produced millions of physicists. There aren't many jobs in science for them, so they go to Wall Street and Silicon Valley to apply their analytical skills to more practical and rewarding efforts.

    Besides, those who stay in science don't work alone. It's very difficult to imagine an independent person like Einstein ever tolerating this.

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    In modern society there is a great deal of argument about competition. Some value it highly, believing that it is responsible for social progress and prosperity(繁荣). Others say that competition is bad; that it sets one person against another; that it leads to unfriendly relationship between people.

    I have taught many children who held the belief that their self-worth relied on how well they performed at tennis and other skills. For them, playing well and winning are often life-and-death affairs. In their single-minded pursuit of success, the development of many other human qualities is sadly forgotten.

    However, while some seem to be lost in the desire to succeed, others take an opposite attitude. In a culture which values only the winner and pays no attention to the ordinary players, they strongly blame competition. Among the most vocal are youngsters who have suffered under competitive pressures from their parents or society. Teaching these young people, I often observe in them a desire to fail. They seem to seek failure by not trying to win or achieve success. By not trying, they always have an excuse: "I may have lost, but it doesn't matter because I really didn't try."What is not usually admitted by themselves is the belief that if they had really tried and lost, that would mean a lot. Such a loss would be a measure of their worth. Clearly, this belief is the same as that of the true competitors who try to prove themselves. Both are based on the mistaken belief that one's self-respect relies on how well one performs in comparison with others. Both are afraid of not being valued. Only as this basic and often troublesome fear begins to dissolve(缓解)can we discover a new meaning in competition.

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