Text 2
Each advance in microscopic technique has provided scientists with new perspectives on the function of living organisms and the nature of matter itself. The invention of the visible-light microscope late in the sixteenth century introduced a previously unknown realm of single celled plants and animals. In the twentieth century, electron microscope have provided direct views of viruses and minuscule surface structures. Now another type of microscope, one that utilizes X rays rather than light or electrons, offers a different way of examining tiny de tails; it should extend human perception still farther into the natural world.
The dream of building an X-ray microscope dates to 1895; its development, however, was virtually halted in the 1940’ s because the development of the electron microscope was progressing rapidly. During the 1940’ s, electron microscopes routinely achieved resolution better than that possible with a visible-light micro
A. They will probably replace electron microscopes altogether.
B. They will eventually he much cheaper to produce than they are now.
C. They will provide information not available from other kinds of microscopes.
D. They will eventually change the illumination range that they now use.
Text 2
Each advance in microscopic technique has provided scientists with new perspectives on the function of living organisms and the nature of matter itself. The invention of the visible-light microscope late in the sixteenth century introduced a previously unknown realm of single celled plants and animals. In the twentieth century, electron microscope have provided direct views of viruses and minuscule surface structures. Now another type of microscope, one that utilizes X rays rather than light or electrons, offers a different way of examining tiny de tails; it should extend human perception still farther into the natural world.
The dream of building an X-ray microscope dates to 1895; its development, however, was virtually halted in the 1940’ s because the development of the electron microscope was progressing rapidly. During the 1940’ s, electron microscopes routinely achieved resolution better than that possible with a visible-light micro
A. see viruses directly
B. develop the electron microscope later on
C. understand more about the distribution of the chemical elements
D. discover single-celled plants anal animals they had never seen before
Each nation has its own odd character which distinguishes it from others. But the people of the world have more points in which they are all like each other than points in which they are different. One type of person that is common in every country is the one who always tries to do as little as he possibly can and to get as much in return as he can. His opposite, the man who is in the habit of doing more than is strictly necessary and who is ready to accept what is offered in return, is rare everywhere.
Both these types are usually not aware of their character. The man who avoids effort is al ways talking about his "rights". The man who is always doing more than his share talks of "duties": he feels that the individual is in debt to society, and not society to the individual. As a result of their views, neither of these men thinks that he behaves at all strangely.
The man who tries to do as little as he can is always full of excuses: If
A. his friends
B. only himself
C. his employer
D. other people
Text 4
Each time you step into those faded old Jeans, you put on a piece of history. The world’ s favorite trousers are now over a hundred years old, and here’ s how they started out.
The first Jeans were made in 1850, in the California gold rush. A man named Levi Strauss realized that the gold - diggers’ normal trousers weren’ t strong enough for the work they had to do and were wearing Out quickly. Strauss had some strong canvas, which he was going to make into tents and wagon covers to sell to the workers. Instead, he made some trousers out of it and these became the first Jeans. They were brown and called the waist -high overall.
The trousers sold well, and Strauss began looking around for ways of making them even tougher. He found a material that was better than canvas-- a durable cotton that was manufactured only in the south of France. In a town called Nimes, the material was denim--the name coming from the French for
A. take a bath with their jeans on
B. make the jeans more comfortable
C. make the jeans more fashionable
D. make the jeans smaller for a tiny skin tight fit
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