单选题With a view to correcting the mistakes of our forefathers, the author suggests that______.

单选题A very interesting and important development in science is a device called laser. A laser is a machine which produces a light beam. The light produced by a laser is a very special kind of light. The light, called laser beam, is powerful and can be made to do many things. The laser was first developed in 1960, about half a century ago. There are many different uses for lasers and several different types have been developed. Some use gases to produce the light beam. The gases are heated and cooled, and these processes cause the gases to produce energy in the form of light. One special point of lasers is that the light beam can be stored. If the stored light is then suddenly let go, it is extremely powerful. The light from a laser beam can be used either by storing it and letting it go suddenly, or by using it in a continuous stream. There are three important areas where the control of the laser beam has been put into use by scientists. These areas are industry, communications, and medicine. In each area, the scientists have been able to use the laser to do things that they could not do in another way. The laser has been very helpful. In industry, the laser beam has been used for measurement and drilling. When something large is being built—for example, a large bridge—it is important to have very accurate measurements. By accurate measurement, lasers are also helpful in laying down pipelines over long distances. As lasers become more common in industry, there will be more and more uses for them.

单选题The manager was unable to________his anger any longer, so he blamed the secretary ruthlessly.

单选题 Passage Three Questions 23 to 25 are based on the passage you have just heard.

单选题What makes scientists doubt about the belief that Megalodon is extinct?[A] The discovery of many "Living Fossils". [C] The discovery of a live Coelacanth.[B] The discovery of the fossils of lobsters. [D] The discovery of the fossils of sea urchins.

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单选题After a visit of only nine months he wrote a ___________ book called Democracy in America, which is a classic study of the American way of life.

单选题Questions 16 to 18 are based on the passage you have just heard.

单选题WhenwasthefootballgameshownonTV?[A]LastSundayevening.[B]LastSaturdayevening.[C]LastSaturdayafternoon.

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单选题Which of the following may be one of the problems for office employees?

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单选题A man ______ kisses or embraces other men.