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A terrible traffic accident happened; people were saddened when they watched the （）sight on TV.
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A crowd gathered to see what had happened.
In the United States, the need to protect plant and animal species has become a highly controversial and sharply political issue since the passage of the Endangered Species Act in 1973. The act, designed to protect species’ living areas, and policies that preserve land and forests compete with economic interests. In the 1990’s, for example, the woodcutters in the Western United States were challenged legally in their attempt to cut trees for timber in the Cascade Mountains. The challenge was mounted to protect the endangered spotted owl (猫头鹰), whose remaining population occupies these forests and requires the intact, ancient forest for survival. The problematic situation set the interests of environmentalists against those of corporations and of individuals who stood to lose jobs. After months of debate and legal battles, the fate of the woodcutters--and the owls--was still undecided in mid-1992.Similar tensions exist between the developed and the developing nations. Many people in industrialized nations, for example, believe that developing nations in tropical regions should do more to protect their rain forests and other natural areas. But the developing countries may be impoverished (使穷困), with populations growing so rapidly that using the land is a means to temporarily avoid worsening poverty and starvation.Many of the changes to Earth that concern scientists have the potential to rob the planet of its biological rich- ness. The destruction of Earth’s ozone layer (臭氧层), for example, could contribute to the general process of impoverishment by allowing ultra-violet rays to harm plants and animals. And global warming could wipe out species unable to quickly adapt to changing climates. Clearly, protecting Earth’s biological diversity is a complex problem. But solutions to humanity’s current problems will come only through coordinated international efforts to control human population, stabilize the composition of the atmosphere, and preserve intact Earth’s complex web of life. Why does the author say that the protection of endangered species is a highly controversial issue（）
某分部工程双代号网络计划如下图示，其关键线路有( )条。
The estimates of the numbers of home-schooled children vary widely. The U. S. Department of Education estimates there are 250,000 to 35,000 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 herdlike 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 as 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." According to Van Galen some home schoolers believe that （）
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