单选题Why don"t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many years. Now they"re beginning to fill in the blanks. Not long ago, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that fly by night? Tests with artificial stars have proved that certain night-flying birds are able to follow the stars in their long-distance flights. A dove (鸽子) had spent its lifetime in a cage and had never flown under a natural sky. Yet it showed an inborn ability to use the stars for guidance. The bird"s cage was placed under an artificial star-filled sky. The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the position of the artificial stars caused a change in the direction of his flight. But the stars are apparently their principal means of navigation (航行) only. When the stars are hidden by clouds, they seemingly find their way by such landmarks as mountain ranges, coast lines, and river courses. But when it"s too dark to see these, the doves circle helplessly, unable to find their way.

单选题The dairy industry has taken great pains to increase the number of products from which the butterfat has been ______. A. revived B. removed C. excluded D. isolated

单选题The laser is a very useful means for long-distance communications, the great accuracy in the direction of its beams ______ effective use of small amount of power.

单选题Joseph Heller is a great novelist who has thrilled thousands of readers, ______ many American accomplished novelists kneel at his feet and can't help singing his praises. A. in that B. so much so that C. since D. while

单选题Speaker A: It"s getting rather late. I have to say goodbye. Speaker B: ______

单选题Speaker A: I can't seem to find a color TV of the new model. Speaker B:_____

单选题There is an advertisement in today's Times that might interest Robert. I'll ______ and send it to him. A. point it out B. cut it out C. show it out D. work it out

单选题Speaker A: Dr. Smith, what"s wrong with my father? Speaker B: Well, ______ considering his advanced age.

单选题Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (52) an educational institution, and they are required to study for a (53) of fifteen hours a week on a daytime course. Prospective students have to show that they can afford their studies, and that they have sufficient (54) resources to support themselves (55) in this country. In order to work here the foreigner needs a work permit, (56) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (57) these permits, and there is little that can be done (58) it; it would be extremely unwise for a foreign visitor to work (59) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the European countries, who are often given (60) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (61) part-time jobs while they are studying here.

单选题Scarcely ______ those words when suddenly the monster was transformed into a very handsome youth.

单选题By the time he arrives in Beijing tomorrow, we ______ here for two days.

单选题A: ______ B: It"s very easy. You just pick up the receiver, drop the coin in the slot, and dial the number you want.

单选题Culture includes the beliefs and attitudes we learn. It is the ______ of behavior that helps people to live together and make one group of people different from another group. A. format B. pattern C. form D. mode

单选题Man: Jane, you won't believe it. I won the lottery! Women: ______ Man: No. It's true. When I found out, I was shocked.

单选题W: You bought a pair of jeans yesterday, didn't you? What are they like?M: Oh, they are pretty much like my other ones, except with a larger waist. I guess I haven't spent much time exercising lately.Q: What can we infer from the conversation about the man? A. He prefers to wear jeans with a larger waist. B. He has been extremely busy recently. C. He has gained some weight lately. D. He enjoyed going shopping with Jane yesterday.

单选题Speaker A: Where can I find a map of the university campus? Speaker B: ______ A. Yeah, with a map you won't get lost on such a big campus. B. Sorry, we don't sell maps and things like that here. C. Have you tried the information center? D. OK, let me tell you how to get the university campus.

单选题If people do not tell ______ for an electronic computer to do, it will accomplish nothing. This is the reason why electronic computers will never be able to replace man. A. that B. what C. how D. when

单选题According to the passage, the total supply of food in America every year reaches ______.

单选题Man: The competition is increasingly fierce. What shall we do next?Woman: If other companies lower their prices, we’ll have to follow suit.Question: What does the woman suggest? A．Doing the same as other companies have done B．Producing the same suits as other companies. C．Fighting against other by cutting down the cost. D．Working out other policies to compensate foe the loss.

单选题It was during the morning rush hour ______the bomb exploded. A. that B. when C. while D. before