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When was the atomic bomb dropped on Hiroshima？
A) As soon as the secret was revealed
B) At dawn on July 16, 1945
C) Immediately after the test
D) Several weeks after the test
答案
更多“When was the atomic bomb dropped on Hiroshima？A) As soon as the secret was revealed”相关的问题
第1题
According to the passage, a fire storm______.
A．is often seen when large forest fires break out.
B．often occurs after the atomic explosions
C．produces forces that draw everything into the fire
D．is a disaster that can destroy everything in the area
第2题
Albert Einstein
Born in 1879, in Ulm, Germany, Einstein was two years old when his parents moved to Munich. There his father opened a business in electrical supplies. As a boy, Einstein did not learn to talk until later than others of his age, and in his early childhood he was not considered especially bright. But by the time he was fourteen years old, he had recovered from a slow start to the extent that he had taught himself advanced mathematics from textbooks. By then he knew what he wanted to be when he grew up. He wanted to be a physicist and devote himself to research.
The Einsteins, however, could not afford to pay for the advanced education young Einstein needed. The family business had declined, and they were forced to leave Munich to live in Milan, Italy, where they had relatives. As for Albert, the family did manage to send him to a technical school in Switzerland, and later to the Federal Institute of Technology in Zurich.
In 1901, when Einstein was twenty-two years old, he began teaching, and in 1902 he went to work as a patent office examiner in Bern. Now able to pay his own expenses, he continued his schooling at the University of Zurich, where he received a doctor' s degree in 1905. This was the period when he first began the research which led to his famous theory of relativity.
To most people it is not easy to explain why Einstein' s theory has had such an immense effect upon the whole scientific and intellectual world. After its formation, scientists never again regarded the world as they had before. The theory set forth new and far-reaching conclusions about the nature of space, time, motion, mass, energy, and the relations governing all these. Basically the theory proposed, among other things, that the greatest speed possible is the speed of light; that the rate of a clock moving through space will decrease as its speed increases; and that energy and mass are equal and interchangeable. This latter claim, based on the formula "energy equals mass times the square of the speed of light" was later proved by atomic fission, on which the atomic bomb is based.
Toward the end of his life, when Einstein was asked to explain his law of relativity to a group of young students, he said: "When you sit with a nice girl for two hours, you think it's only a minute. But when you sit on a hot stove for a minute, you think it's two hours. That is relativity."
Einstein had an effect on science and history that only a few men have ever achieved. An American university president once commented that "Einstein has created a new outlook, a new view of the universe. It may be some generations before the average mind grasps the identity of time and space, and so on—but even ordinary men understand now that the universe is something vaster than ever thought before."
By 1914 Einstein had gained world fame. He accepted the offer to become a professor at the Prussian Academy of Sciences in Bedim He had few duties, little teaching, and unlimited opportunities for study. It was an ideal position, but soon his peace and quiet were broken by the First World War. Einstein hated violence. Though he was not personally involved, the war and its misery affected him deeply. He lost interest in much of his research. Only when peace finally came in 1918 was he able to get back to work.
During the years following World War [, Germany heaped honors upon Einstein. He was persuaded to become director of Theoretical Physics in the Kaiser Wilhelm Institute. He won the Nobel Prize for Physics in 1921. Prussia made him an honorary citizen. Potsdam built an Einstein Tower in its Astrophysical Institute. Berlin held public celebration on his fiftieth birthday. Being a shy man, Einstein did not attend, but he received several baskets full of cards, letters, and telegrams expressing admiration and b
A．Y
B．N
C．NG
第3题
When you are busy, a boy is a trouble – maker and a noise. When you want him to make a good impression, his brain turns to jelly or else he becomes a wild creature bent on destroying the world and himself with it.
A boy is a mixture – he has the stomach of a horse, the digestion (消化力 ) of stones and sand,the energy of an atomic bomb, the curiosity of a cat, the imagination of a superman, the shyness of a sweet girl, the brave nature of a bull, the violence of a firecracker, but when you ask him to make something, he has five thumbs (拇指 ) on each hand.
He likes ice cream, knives, saws, Christmas, comic books, woods, water (in its natural habitat), large animals, Dad, trains, Saturday mornings, and fire engines. He is not much for Sunday schools, company, schools, books without pictures, music lessons, neckties, barbers, girls, overcoats, adults, or bedtime.
Nobody else is so early to rise, or so late to supper. Nobody else gets so much fun out of trees, dogs, and breezes. Nobody else can put into one pocket a rusty knife, a half eaten apple, a three-feet rope, six cents and some unknown things.
A boy is a magical creature – he is your headache but when you come home at night with only shattered pieces of your hopes and dreams, he can mend them like new with two magic words, “ Hi, Dad! ”
1.The whole passage is in a tone(调子 ) of ().
A.humor and affection
B.respect and harmony
C.ambition and expectation
D.confidence and imagination
2.Could you figure out the meaning of the underlined sentence？()
A.He has altogether five fingers.
B.He is slow, foolish and clumsy.
C.He becomes clever and smart.
D.He cuts his hand with a knife.
3.According to the writer, boys appreciate everything in the following except .()
A.ice cream
B.comic books
C.Saturday mornings
D.Sunday schools
4.What does the writer feel about boys？()
A.He feels curious about their noise
B.He is fed up with these creatures
C.He is amazed by their naughtiness
D.He feels unsafe staying with them
第4题
A．Going to the moon.
B．The atomic bomb.
C．AIDS.
D．Watergate.
第5题
.
A) competed B) conceived C) consumed D) concealed
第7题
Experts cannot tell when earthquakes will occur. But they can tell us why they happen. In the center of the earth a huge, hot mass moves constantly, like rushing water. Vast areas of solid rock, called plates(板岩), rest on top of this mass. Sometimes two plates move and strain against each other. When they finally break, the earth's surface moves, and an earthquake begins. Some quakes have other causes.
Most of the world's earthquakes happen around or in the Pacific Ocean. Called the "ring of fire" by scientists, this area suffers from about twenty powerful earthquakes each year. But there are others even too small to be felt. They occur a million times a year. However, they take place under the ocean or away from people. Therefore, there is no damage.
Scientists measure the strength of earthquakes with sensitive machines called seismographs(地震仪). These instruments can record shock waves from earthquakes in any part of the world. Seismographs show us that some earthquakes can give off as much energy as 200 million tons of TNT. That is 10,000 times stronger than an atomic bomb!
Powerful earthquakes can sometimes take an enormous number of human lives. The worst earthquake on record took place in China in 1556. At that time 830,000 people died. In 1737, 300,000 were killed during an earthquake in India. In modern times, China was hit again with the world's second worst quake in 1976. It left 650,000 dead.
Many cities are taking steps to prevent loss of life in earthquakes. Buildings are being made quakeproof. Rescue teams practice saving victims. Partly because of such steps, the 1989 San Francisco quake took only sixty lives.
We can infer from the passage that ______.
A．a great mass of solid rock suddenly moves deep inside the earth
B．earthquake usually does great damage to human beings
C．earthquake cannot be measured
D．earthquake takes place with a loud roar
第8题
A.universal
B.indlusive
C.indefinite
D.conventional
