单选题As we know, physics ______ the science of energy.A. wasB. wereC. isD. are

单选题(Most) tree frogs (change) colors (from time to time) to fit in with (its environment).

单选题Nancy had (a great deal) of trouble (to concentrate on) her work (because of) the noise (in) the next room.A. a great deal ofB. to concentrate onC. because ofD. in

单选题Television broadcasts are (1) to an area that is within the (2) of the sending station or its relay (中转站). (3) television relays are often placed on hills and mountains so that they can (4) a wider region, they still can not cover more land than one from the hilltop (5) a clear day. However, the rays also go out into the atmosphere, (6) there is a relay station on a satellite that (7) around the earth, it can send the pictures to any point on the earth from which the satellite is (8) . Three satellites (9) turning around over the equator (赤道) send any television program to any part of the earth. (10) makes it possible for world (11) of newspapers to give the news in all countries at the same time. (12) it may be possible for a subscriber (户) to a televised newspaper to (13) a button and see a newspaper page (14) his television screen. He could also decide when he wants the page (15) , (16) , by dialing different numbers such as (17) on a telephone dial, he could choose the language or the edition of the paper he wants to read. It seems strange to think that, even today, methods of the (18) are not entirely useless. For example, sometimes (19) agencies which use radio also use pigeons to (20) messages between offices in large cities because the pigeons are not bothered by traffic problems.

单选题As a new graduate, he doesn"t know ______ it takes to start a business here.

单选题Every means______since then.A. has been tryingB. have been tryingC. have been triedD. has been tried

单选题We hurried to the station______find ourselves three hours earlier for the train. A. only to B. in order to C. so as to D. such as to

单选题——Shall I use your dictionary?——________

单选题The teacher tried to make the new student feel ______. A. with ease B. at leisure C. at ease D. at rest

单选题He is __________ able to read Latin than I am.

单选题I left for the office "earlier than usual this morning ______ traffic jam.

单选题He (suggested) that she (met) with her lawyer (before) signing the (final) agreement.

单选题Student: __________, I’d like to return these books. Assistant: OK. Oh, these books are a month overdue. Sorry, you have to pay a fine. I know. But how much should I pay? Assistant:Just a minute. Let me check.

单选题The American and the British ______ a large number of social customs.

单选题As a gardener, Jim has to water the flowers and ______ the grass in the garden every morning. A. trim B. improve C. refine D. repair

单选题Ted: Do you have to have that TV on quite so loud? Paul: ______, is it bothering you?

单选题If workers had been paid decent wages, profits ______ so great.

单选题The city has always been an engine of intellectual life, from the 18th century cafes of London, where citizens gathered to discuss chemistry and politics, to the Left Bank bars of modem Paris, where Picasso talked about modem art. Without the metropolis, we might not have had the great art of Shakespeare. And yet, city life isn"t easy. Now scientists have begun to examine how the city affects the brain, and the results are depressing. Just being in an urban environment, they have found, impairs (损害) our basic mental processes. After spending a few minutes on a crowded city street, the brain is less able to hold things in memory, and suffers from reduced self control. While it"s long been recognized that city life is exhausting, this new research suggests that cities actually dull our thinking, sometimes dramatically so. One of the main forces at work is a complete lack of nature, which is surprisingly beneficial for the brain. Studies have demonstrated, for instance, that hospital patients recover more quickly when they can see trees from their windows, and that women living in public housing are better able to focus when their apartments overlook a lawn. Even these glimpses of nature improve brain performance, it seems, because they provide a mental break from the urban life. This research arrives just as humans cross an important milestone (里程碑). For the first time in history, the majority of people live in cities. Instead of inhabiting wide open spaces, we"re crowded into concrete jungles, surrounded by traffic and millions of strangers. In recent years, it"s become clear that such unnatural surroundings have important implications for our mental and physical health, and can powerfully alter how we think. This research is also leading some scientists to dabble (涉足) in urban design, as they look for ways to make the city less damaging to the brain. The good news is that even slight alterations, such as planting more trees in the inner city or creating urban parks with a greater variety of plants, can significantly reduce the negative side effects of city life. The mind needs nature, and even a little bit can be a big help.

单选题It usually takes much less time to fly from one country to another than traveling by train.

单选题Janet: Bye, Marco! Have a nice day! Marco: ______