题目内容
（请给出正确答案）
After the first atomic bomb explosion, everybody agreed that ________.
A) it was wise to choose Alamogordo as the test site
B) man had entered the age of nuclear warfare
C) it was not wise to use such a powerful weapon
D) it was not possible to keep the technology of making atomic bombs secret
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更多“After the first atomic bomb ex…”相关的问题
Fermi Problem
On a Monday morning in July, the world’s first atom bomb exploded in the New Mexico desert. Forty seconds later, the shock waves reached the base camp where the Italian-American physicist Enrico Fermi and his team stood. After a mental calculation, Fermi announced to his team that the bomb’s energy had equated 10,000 tons of TNT. The bomb team was impressed, but not surprised. Fermi’s genius was known throughout the scientific world. In 1938 he had won a Nobel Prize. Four years later he produced the first nuclear chain reaction, leading us into the nuclear age. Since Fermi’s death in 1954, no physicist has been at once a master experimentalist and a leading theoretician.
Like all virtuosos, Fermi had a distinctive style. He preferred the most direct route to an answer. He was very good at dividing difficult problems into small, manageable bits—talent we all can use in our daily lives.
To develop this talent in his students. Fermi would suggest a type of question now known as a Fermi problem. Upon first hearing one of these, you haven’t the remotest notion of the answer, and you feel certain that too little information had been given to solve it. Yet when the problem is broken into sub-problems, each answerable without the help of experts or books, you can come close to the exact solution.
Suppose you want to determine Earth’s circumference without looking it up. Everyone knows that New York and Los Angeles are about 3,000 miles apart and that the time difference between them is three hours. Three hours is one eighth of a day, and a day is the time it takes the planet to complete one rotation, so its circumference must be eight times 3,000 or 24,000 miles. This answer differs from the true value, 24,902.45 miles, by less than four percent.
Ultimately the value of dealing with everyday problems the way Fermi did lies in the rewards of making independent discoveries and inventions: It doesn’t matter whether the discovery is as important as determining the power of an atom or as small as measuring the distance between New York and Los Angeles. Looking up the answer, or letting someone else find it, deprives you of the pleasure and pride that accompany creativity, and deprives you of an experience that builds up self-confidence. Thus, approaching personal dilemmas as Fermi problems can become a habit that enriches your life.
Fermi’s team was impressed by Fermi’s announcement in the base camp because he could even work out the power of the atom bomb in his mind.
A．Right
B．Wrong
C．Not mentioned
Albert Einstein was the first to suggest the existence of stimulated emission in a paper published in 1917. However, for many years physicists thought that atoms and molecules always were much more likely to emit light spontaneously and that stimulated emission thus al- ways would be much weaker. It was not until after the Second World War that physicists began trying to make stimulated emission dominate. They sought ways by which one atom or molecule could stimulate many others to emit light, amplifying it to much higher powers.
The first to succeed was Charles H. Townes, then at Columbia University in New York. Instead of working with light, however, he worked with microwaves, which have a much longer wavelength, and built a device he called a "maser" for Microwave Amplification by the Stimulated Emission of Radiation. Although he thought of the key idea in 1951, the first maser was not completed until a couple of years. Before long, many other physicists were building masers and trying to discover how to produce stimulated emission at even shorter wavelengths.
The key concepts emerged about 1957. Townes and Artyur Schawlow, then at Bell Telephone Laboratories, wrote a long paper outlining the conditions needed to amplify stimulated emission of visible light waves. At about the same time, similar ideas crystallized in the mind of Gordon Gould, then a 37-year-old graduate student at Columbia, who wrote them down in a series of notebooks. Townes and Schawlow published their ideas in a scientific journal, Physical Review Letter, but Gould filed a patent application. Three decades later, people still argue about who deserves the credit For the concept of the laser.
The word "it" (line 5, para 1) refers to______.
A．light bulb
B．energy
C．molecule
D．atom
根据材料请回答 16～22 题
Fermi Problem
On a Monday morning in July, the world' s first atom bomb exploded in the New
Mexico desert.Forty seconds later, the shock waves reached the base camp where the I-talian-American physicist Enrico Fermi and his team stood.After a mental calculation, Fermi announced to his team that the bomb's energy had equated 10,000 tons of TNT.The bomb team was impressed, but not surprised.Fermi' s genius was known throughout the scientific world.In 1938 he had won a Nobel Prize.Four years later he produced the first nuclear chain reaction, leading' us into the nuclear age.Since Fermi's death in 1954,no physicist has been at once a master experimentalist (实验家) and a leading theoretician
Like all virtuosos (大师), Fermi had a distinctive style.He preferred the, most direct route to an answer.He was very good at dividing difficult problems into small, managea-ble bits talent we all can use in our daily lives,
To develop this talent in his students, Fermi would suggest a type of question now known as a Fermi problem.Upon first hearing one of these, you haven't the remotest no-tion of the answer, and you feel certain that too little information had been given to solve it.Yet when the problem is broken into sub-problems， each answerable without the help of experts or books, you can come close to the exact solution.
Suppose you want to determine Earth's circumference without looking it up.Every-one knows that New York and Los Angeles are about 3,000 miles apart and that the time difference between them is three hours.Three hours is one-eighth of a day, and a day is the time it takes the planet to complete one rotation (旋转), so its circumference must be eight times 3000 or 24000 miles.This answer differs from the true value, 24,902.45 mi-les, by less than four percent.
Ultimately (最终地) the value of dealing with everyday problems the way Fermi did lies in the rewards of making independent discoveries and inventions.It doesn't matter whether the discovery is as important as determining the power of an atom or as small as measuring the distance between New York and Los Angeles.Looking up the answer, or letting someone else find it, deprives you of the pleasure and pride that accompany creativ-ity, and deprives you of an experience that builds up self-confidence.Thus, approaching personal dilemmas as Fermi problems can become a habit that enriches your life.
第 16 题 Fermi's team was impressed by Fermi' s announcement in the base camp because he could even work out the power of the atom bomb in his mind.
A．Right
B．Wrong
C．Not mentioned
Breast cancer can come back 10 years after you were first diagnosed.
A．Right
B．Wrong
C．Not mentioned
__________(在出现紧急情况时), the first few minutes after you dial 999 are the most critical.
The world's first large electronic computer (1946) ______.
A．was built after the World War Ⅱ
B．was used for over 10 years
C．contained 25000 valves
D．could perform only 10000 calculations per second
A) kept track
B) lost track
C) signed up
D) fell into
Which group of mice is the healthiest among the 3 groups after 3 years？
A．The first group.
B．The second group.
C．The last group.
D．All the 3 groups.
