单选题Teachers can hardly be ______ careful when they instruct a lesson. A. very B. enough C. too D. so

单选题There ______ the last piece of cake and the last spoonful of ice cream.

单选题Give the books to ______ needs them for the English class and the writing class.

单选题Vivian: Guess what? Mr. Hale in our office will be promoted as the sales manager. Betty: ______

单选题There is no reason why you should tell them ______ that you are going.

单选题The United States 1 a large part of the North American continent. Its neighbors are Canada 2 the north, and Mexico to the south. 3 the United States is a big country, it"s not the largest in the world. In 1964 its population was over 160,000,000. When this land first became a nation, after winning independence from England, it had thirteen states, 4 of the states was represented on the American flag by a star. All the states were in the eastern part of the continent. As the nation grew towards the west, new states were in the eastern part of the continent. As the nation grew towards the west, new states were added and new stars 5 on the flag. For a long time, there were 48 states. In 1959, however, two more stars were added to the flag 6 the new states of Alaska and Hawaii. Sometimes 7 is said that the Indians are the only real Americans. Most Americans, however, are descendants (后代) of people who came from all over the world to find a new 8 in a new land. 9 who came first and in greatest numbers to make their home on the eastern coast of North America were mostly from England. It is for that reason that the language of the United States is English and that its culture and customs are more like 10 of England than of any other country in the world.

单选题A Russian-made rocket ______ a US telecommunications satellite ______ successfully ______ on Thursday.

单选题Margret: Would you mind not using my toothpaste? Allen: I"m sorry. ______

单选题Your story is perfect; I've never heard ______ before.A. the better oneB. the best oneC. a better oneD. a good one

单选题— ______ ? Kate, you look pale. —Oh, thank you. It doesn't matter.

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It's impossible for a child to do so much work within a short period of time, ______?

单选题Michael studied hard before the examination in mathematics, and it ______ . He made an A. A. paid out B. paid off C. paid over D. paid well

单选题The idea ______ to him in his dream and he decided to carry it out. A．happened B．struck C．appeared D．occurred

单选题The foreigner tried his best, but he still couldn't make his point______.

单选题(Look at) the beautiful (flowers) here! (How) wonderful they (are smelling). A. Look at B. flowers C. How D. are smelling

单选题In your car you may have a cell phone, a telephone also known as a mobile phone that you can carry around and use anywhere. On your way, you may feel coordinated and enjoy your hands-free phone talking while driving. But recent studies suggest that it isn"t the dialing or the arm waving that makes driving while talking on a cell phone dangerous. It is the yakking itself—or more precisely, the continuous conversation with someone who isn"t present—that makes. David Strayer, a Utah psychologist, says "Your driving performance while talking on a cell phone is weakened at levels comparable to, or worse than, driving with a blood alcohol level of 0.08," which is the legal limit in most states of America. Using a driving-training simulator, Strayer and his colleagues compared the attention levels and response time of 110 drivers in various situations. In dense traffic, cell phone users were about 20 percent slower to respond to sudden hazards than other drivers, and they were about twice as likely to drive into the back of a braking car in front of them. "Cell phone drivers are obtaining less than 50 percent of the visual information that non-cell drivers are getting," says Strayer. "Looking and seeing are not one and the same." By contrast, the researchers found that listening to the radio or conversing with passengers is not as hazardous. "When a dangerous situation arises, the driver and passengers put their conversation on pause," Strayer says. Whether talking with a passenger or someone on a cell phone, however, people are less able to recall the details of a conversation carded on while driving. "So it might not be good for your economic health to discuss investment strategies with your agent while either of you is driving." Strayer adds lastly.