单选题It is _______  to stare directly at the sun. 

单选题In order to grow well, the Blue Sprace, like other pine trees, ______ a temperate climate.

单选题Mr. Wayne found the metal box ______.

单选题Scientists have been struggling to find out the reason behind blushing （脸红）。Why would humans evolve（进化） a 21__________ that puts us at a social disadvantage by 22__________ us to reveal that we have c

单选题I'm afraid I've taken ______ too much of your time.

单选题The estimates of the numbers of home-schooled children vary widely. The U. S. Department of Education estimates there are 250,000 to 350,000 home-schooled children in the country. Home-school advocates put the number much higher—at about a million. Many public school advocates take a harsh attitude toward home schoolers, perceiving their actions as the ultimate slap in the face for public education and a damaging move for the children. Home schoolers harbor few kind words for public schools, charging shortcomings that range from lack of religious perspective in the curriculum to a herd like approach to teaching children. Yet, as public school officials realize they stand little to gain by remaining hostile to the home-school population, and as home schoolers realize they can reap benefits from public schools, these hard lines seem to be softening a bit. Public schools and home schoolers have moved closer to tolerance and, in some cases, even cooperation. Says John Marshall, an education official, "We are becoming relatively tolerant of home schoolers." The idea is, "Let"s give the kids access to public school so they"ll see it"s not so terrible as they"ve been told, and they"ll want to come back." Perhaps, but don"t count on it, say home-school advocates. Home schoolers oppose the system because they have strong convictions that their approach to education—whether fueled by religious enthusiasm or the individual child"s interests and natural pace—is best. "The bulk of home schoolers just want to be left alone," says Enge Cannon, associate director of the National Center for Home Education. She says home schoolers choose that path for a variety of reasons, but religion plays a role 85 percent of the time. Professor Van Galen breaks home schoolers into two groups. Some home schoolers want their children to learn not only traditional subject matter but also "strict religious doctrine and a conservative political and social perspective. Not incidentally, they also want their children to learn—both intellectually and emotionally—that the family is the most important institution in society." Other home schoolers contend "not so much that the schools teach heresy (异端邪说), but that schools teach whatever they teach inappropriately," Van Galen writes. "These parents are highly independent and strive to "take responsibility" for their own lives within a society that they define as bureaucratic and inefficient."

单选题The U. S. Senate unanimously passed a resolution ______ Israel's military attack on Lebanon.

单选题In many buildings hot water ______ through pipes to keep rooms warm.

单选题Anyone who has a sore throat should______from alcohol.

单选题She refused to tell us the ______ of the news although we insisted that she should.

单选题The reporter refused to name the ______ of his information.

单选题If you ______ a heart-attack or stroke victim who needs your assistance, your first response should be to stay calm and urge bystanders to call for an ambulance.

单选题______he retires, Prof. Baker will have taught in the university for almost forty years.

单选题 重庆 重庆位于中国西南部，长江上游。它是一座举世闻名的山城，最突出的特点是地形起伏有致，立体感强。重庆凭借长江“黄金水道”之便，依托丰富的资源和广阔的市场，从汉代起就是长江上游的工商业重镇，如今更发展为集重工业、轻工业、贸易等为一体的经济、政治和文化中心。重庆处处都有中国传统文化的印痕，历代诗人如李白、陆游等，都在这里写有许多脍炙人口的名篇佳句。此外，重庆还是川菜的主要代表地域之一。

单选题Does ______ matter if he can't finish the job on time?

单选题One can understand others much better by noting the immediate and fleeting reactions of their eyes and ______ to expressed thoughts.

单选题The number of the newly admitted students ______ over 300, but a number of them ______not arrived yet.

单选题It was clear that the storm ______ his arrival by two hours. A. retarded B. retrieved C. refrained D. retreated

单选题Insomnia, or “poor sleep”, can have bad effects on a persons health and general well-being. It can_____21on both our physical and mental health and can lead to other health___请作答此空__22. Insomnia