题目内容
214. The mass of people in that country _________not Buddhists (佛教徒) but Christians.
A. is B. are C. was D. Am
B
The definition of the standard kilogram is almost entirely wrong. Getting that definition right is a challenge that has tried the patience and intelligence of scientists for decades.
Scientists use just seven basic units to define all the other quantities we use — quantities such as speed or electric power. All of those basic units except the kilogram are themselves defined according to natural properties(属性)that are beyond human control.
For example, the standard second (time) is defined as a specific number of vibration(振动)of a type of radiation sent out by atoms of a special metal. The standard metre (length), in turn, is defined as the length of the path light travels under certain conditions.
Not so the kilogram. This orphan of the basic unit family is simply the mass of a small platinum-iridium alloy cylinder(铂—铱合金筒)locked away in a container maintained by the International Bureau of Weights & Measures in Sevres, France, near Paris. Official bodies around the world have copies of the cylinder.
Embarrassingly, the last time the copies were brought to Sevres for a checkup in the 1980s, officials found that some copies had gained about 20 parts per billion in weight compared to the master cylinder since the previous checkup in the 1940s. This implies that the master cylinder itself may be an inconstant standard.
Several efforts in several different countries are under way to redefine the kilogram according to basic physical quantities such as counting the actual number of atoms of a specific substance in a kilogram or the electromagnetic(电磁的)force that balances a kilogram mass against gravity. A project of the latter type at the laboratories in Gaithersburg, Md., hopes eventually to define mass by means of electrical units.
So far, none of these redefinition projects has borne fruit. They require the very accuracy of measurement and control of experimental conditions. The slightest influence — even a tiny change in weather — can ruin results. You’ve got to hand it to scientists who are willing to devote many years to such painstaking — but extremely important — research.
【小题1】 Compared with other basic units, the kilogram is ____.
A.as accurate as other basic units |
B.not universally accepted in the world |
C.not defined according to natural properties |
D.defined in the same way as other basic units |
A.the causes of weight changes had been found |
B.such kind of checks had been carried out regularly |
C.the changes in weight challenged the definition of the kilogram |
D.the consequences of such changes were great in research |
A.is the only way to redefine the kilogram scientifically |
B.has been accepted as the only possible redefinition project |
C.is not as complicated as people understand |
D.has been considered by some scientists as a better approach |
A.Scientists will achieve success in redefining the kilogram in the near future |
B.Some scientists are trying to redefine the kilogram according to basic physical quantities. |
C.The redefining of the standard kilogram is quite complicated and can be affected by a number of factors. |
D.A number of experiments are being carried out to redefine the kilogram. |
Many people believe Henry Ford invented the automobile (汽车). But Henry Ford did not start to build his first car until 1896. That was eleven years after two Germans developed the world's first automobile. Many people believe Henry Ford invented the production line that moved a car's parts to the worker, instead of making the worker move to the parts. That is not true, either. Many factory owners used methods of this kind before Ford. What Henry Ford did was to use other people's ideas and make them better. And he made the whole factory a moving production line.
In the early days of the automobile, almost every car maker raced his cars. It was the best way of gaining public notice. Henry Ford decided to build a racing car. Ford's most famous race was his first one. It was also the last race in which he drove the car himself.
The race was in 1901, at a field near Detroit. All of the most famous cars had entered, but only two were left: the Winton and Ford's. The Winton was famous for its speed. Most people thought the race was over before it began.
The Winton took an early lead. But halfway through the race, it began to lose power. Ford started to gain. And near the end of the race, he took the lead. Ford won the race and defeated the Winton. His name appeared in newspapers and he became well-known all over the United States. Within weeks of the race, Henry Ford formed a new automobile company. In the 1903, a doctor in Detroit bought the first car from the company. That sale was the beginning of Henry Ford's dream. Ford said: "I will build a motor car for the great mass of people. It will be large enough for the family, but small enough for one person to operate and care for. It will be built of the best materials. It will be built by the best men to be employed. And it will be built with the simplest plans that modem engineering can produce. It will be so low in price that no man making good money will be unable to own one."
The Model T was a car of that kind. It only cost $850. It was a simple machine that drivers could depend on. Doctors bought the Model T. So did farmers. Even criminals.They considered it the fastest and surest form of transportation. Americans loved the Model T. They wrote stories and songs about it. Thousands of Model T's were built in the first few years.
【小题1】
What do we know about Henry Ford from Paragraph 1?
A.He made good use of ideas from others. |
B.He produced the first car in the world. |
C.He knew how to improve auto parts. |
D.He invented the production line. |
Why did Henry Ford take part in the 1901 car race?
A.To show off his driving skills. |
B.To draw public attention. |
C.To learn about new technology. |
D.To raise money for his new company. |
“That sale” in Paragraph 4 refers to .
A.the selling of Ford cars at reduced prices |
B.the sale of Model T to the mass of people |
C.the selling of a car to a Detroit doctor |
D.the sales target for the Ford Company |
What was Henry Ford's dream according to the text?
A. Producing cars for average customers.
B. Building racing cars of simple design.
C. Designing more car models.
D. Starting more companies.