单选题We are trying to return the money to ______ lost it.A. the boy B. who C. the one that D. whom

单选题Concerning money or anything else, conflicts between husband and wife usually reflect a power struggle. Conflicts between parent and child often center around the same issue. As children enter adolescence, they begin to demand greater freedom to go where they please, do what they please, and make decisions without parental interference. Many American parents do not know how to deal with their teenagers and seek advice from books, lectures, and parent-training courses. Parents want to maintain a friendly relationship with their teenagers and also want to guide them so that their behavior will be whatever the parents consider proper and constructive. But in a society of rapidly changing social and moral values, parents and children often disagree about what is important and what is right. Arguments may concern such unimportant matters as styles of dress or hairdos. But quarrels may also concern school work, after school jobs, decisions, use of the family car, dating, and sexual behavior. Some families have serious problems with teenagers who drop out of school, run away from home, or use illegal drugs. Because so much publicity is given to the problem teenager, one gets the impression that all teenagers are troublemakers. Actually, relatively few adolescents do anything wrong, and nearly all grow up into "solid citizens" who fulfill most of their parents' expectations. In fact, recent studies show that the "generation gap" is narrowing. The vast majority of teenagers share most of their parents' values and ideas. Many parents feel that they get along with their adolescents quite well.

单选题He ______ a cold last week. A. had caught B. caught C. has caught D. has had

单选题He thinks that the ecosystems assessment will fare better if it is intended as "guidance only and is not in any way an ______ measure."

单选题—My watch is not working. ________? 　　—It’s ten past eleven.

单选题We are all for your proposal that the discussion ______. A. be called off B. was called off C. should call off D. is to call off

单选题He kept his eyes ______ on the screen of the computer to find his useful information.

单选题By the first sentence of the passage the author means the US scientists______.

单选题A lie can travel half way around the world while the truth is putting on its shoes.

单选题In the Gilded Age, people who possessed a calling card______

单选题Pronouns, prepositions, conjunctions and articles are all open class items. (清华2001研)

单选题The author mentions each of the following as an advantage of Chicago's location EXCEPT its ______.

单选题Beijing Television-Station Transmitting Tower really looks magnificent at night when it's {{U}}illuminated{{/U}},

单选题Why does the author mention the visible-light microscope in the first paragraph?

单选题The building is so well {{U}}constructed{{/U}} that it will survive even the strongest earthquake.

单选题{{B}}Text 3{{/B}} This line of inquiry did not begin until earlier this month--more than three months after the accident--because there were "too many emotions, too many egos," said retired Adm. Harold Gehman, chairman of the Columbia Accident Investigation Board. Testifying before the Senate Commerce Committee, Gehman said this part of his inquiry Was in its earliest stages, starting just 10 days ago. But Gehman said he already has concluded it is "inconceivable" that NASA would have been unable or unwilling to attempt a rescue for astronaut, s in orbit if senior shuttle managers and administrators had known there was fatal damage to Columbia's left wing. Gehman told reporters after the hearing that answers to these important questions could have enormous impact, since they could place in a different context NASA's decisions against more aggressively checking possible wing damage in the days before Columbia's fatal return. Investigators believe breakaway insulating foam damaged part of Columbia's wing Shortly after liftoff, allowing superheated air to penetrate the wing during its fiery re-entry on Feb. 1 and melt it from the inside. Among those decisions was the choice by NASA's senior shuttle managers and administrators to reject offers of satellite images of possible damage to Columbia's left wing before the accident. The subject dominated the early part of Wednesday's hearing. Gehman complained that managers and administrators "missed signals" when they rejected those offers for images, a pointedly harsh assessment of the space agency's inaction during the 16 day shuttle mission. "We will attempt to pin this issue down in our report, but there were a number of bureaucratic and administrative missed signals here," Gehman told senators. "We're not quite so happy with the process." The investigative board already had recommended that NASA push for better coordination between the space agency and military offices in charge of satellites and telescopes. The U. S. National Imagery and Mapping Agency in March agreed to regularly capture detailed satellite images of space shuttles in orbit. Still, Gehman said it was unclear whether even images from America's most sophisticated spy satellites might have detected on Columbia's wing any damage, which Gehman said could have been as small as two inches square. The precise capabilities of such satellites was a sensitive topic during the Senate hearing.