题目内容
The day after news broke of a possible revolution in physics ——particles (粒子) moving faster than light ?a scientist leading the European experiment that made the discovery calmly explained it to a standing-room- only crowd at CERN.
The physicist, Dario Auterio, did not try to explain what the results might mean for the laws of physics, let alone the broader world.After an hour of technical talk, he simply said, "Therefore, we present to you today this difference, this unusualness."
But what unusualness it may be.From 2009 through 2011, the massive OPERA detector (探测器)buried in a mountain in Gran Sasso, Italy, recorded subatomic particles called neutrinos ( 中微子) arriving faster than light can move in an empty space.The neutrinos generated at CERN are hardly detectably early.If confirmed, the finding would throw more than a century of physics into disorder.
"If it's correct, it's phenomenal." said Rob Plunkett, a scientist at Fermilab, the Department of Energy physics laboratory in Illinois."We'd be looking at a whole new set of rules" for how the universe works.Those rules would bend, or possibly break, Albert Einstein's special theory of relativity, published in 1905.Basical at the time, the theory tied together space and time, matter and energy, and set a hard limit for the speed of light, later measured to be about 186, 000 miles per second.
No experiment in 106 years had broken that speed limit.Physicists expect strict study to follow, which OPERA and CERN scientists welcomed.
Fermilab operates a similar experiment, called MINOS, that shoots neutrinos from Illinois to an underground detector in Minnesota.In 2007, MINOS discovered a just detectable amount of faster than-light neutrinos, but the permissible difference of error was too big to "mention" , Plunkett said.
Fermilab scientists will reanalyze their data, which will take six to eight months.In 2013, the MINOS detector, now offline, will restart after an upgrade.It could then offer confirmation of the results.
72.Why are the European scientists not sure about the results of the experiment?
A.Because they are so unexpected.
B.Because the scientists do not believe them.
C.Because the scientists are careful and calm.
D.Because they are against the present law of physics.
73.The underlined word " phenomenal" in the fourth paragraph has the closest meaning to .
A.amazing B.attractive C.embarrassing D.sensitive
74.The best title for the passage may be _____.
A.Are the laws of physics in disorder?
B.Particles faster than light; Revolution or mistake?
C.Faster than light measurement: right or wrong?
D.Is Einstein's theory still right today?
75.What may be discussed in the paragraphs to follow?
A.Different opinions about the experiment.
B.How Albert Einstein's theory developed.
C.The new rules for how the universe works.
D.How Fermilab scientists will reanalyze their data.
72. D 73. A 74. B 75. A
Bill Javis took over our village’s news-agency at a time of life when most of us only wanted to relax. He just thought he would like something but not too much to do, and the news-agency was ready-made. The business produced little enough for him, but Bill was a man who only wanted the simplicity and order and regularity of the job. He had been a long-serving sailor, and all his life had done everything by the clock.
Every day he opened his shop at 6:00 a. m. to catch the early trade; the papers arrived on his doorstep before that. Many of Bill’s customers were city workers, and the shop was convenient for the station. Business was tailing off by 10 o’clock, so at eleven sharp Bill closed for lunch. It was hard luck on anybody who wanted a paper or magazine in the afternoon, for most likely Bill would be down on the river bank, fishing, and his nearest competitor was five kilometers away. Sometimes in the afternoon, the evening paper landed on the doorway, and at 4 o’clock Bill reopened his shop. The evening rush lasted till seven, and it was worthwhile.
He lived in a flat above the shop, alone. Except in the very bad weather, you always knew where to find him in the afternoon, as I have said. Once, on a sunny afternoon, I walked home along the river bank from a shopping trip to the village. By my watch it was three minutes past four, so I was astonished to see Bill sitting there on his little chair with a line in the water. He had no luck, I could see, but he was making no effort to move.
“What’s wrong, Bill?” I called out from the path.
For answer, he put a hand in his jacket and took out a big, golden object. For a moment I had no idea what it could be, and then it suddenly went off with a noise like a fire engine. Stopping the bell, Bill held the thing up and called back, “Ten to four, you see, and this is dead right.”
I had never known anyone carrying a brass alarm clock round with him before.
1.Bill Javis became a news-agent when _______.
A. he needed the money
B. he was quite an old man
C. he decided to take up fishing
D. he gave up clock-repairing
2.Bill opened the shop so early in the day because _______.
A. he liked to do as much as possible before he went to work
B. the shop had to be open when the morning papers came
C. he was never sure of time
D. it was then that he did a lot of business
3.From the information given in the passage, who or what do you think was wrong?
A. The bell was-it must have gone off at the wrong time.
B. Bill was-he had dropped off to sleep.
C. The writer’s watch was-it was fast.
D. Bill’s clock was-it was old.