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圆柱底面半径扩大2倍，高不变，侧面积就扩大（）倍，体积扩大（）倍。
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There is no question that the academic enterprise has become increasingly global, particularly in the sciences. Nearly three million students now study outside their home countriesa 57% increase in the last decade. Foreign students now dominate many U.S. doctoral programs, accounting for 64% of Ph. D. s in computer science, for example. Faculty members are on the move, too. Half of the world’s top physicists no longer work in their native countries. And major institutions such as New York University are creating branch campuses in the Middle East and Asia. There are now 162 satellite campuses worldwide, an increase of 43% in just the past three years. At the same time, growing numbers of traditional source countries for students from South Korea to Saudi Arabia (沙特阿拉伯), are trying to improve both the quantity and quality of their own degrees, engaging in a fierceand expensiverace to recruit students and create world-class research universities of their own. Such competition has led to considerable hand-wringing in the West. During a 2008 campaign stop, for instance, then—candidate Barack Obama expressed alarm about the threat that such academic competition poses to U. S. competitiveness. Such concerns are not limited to the United States. In some countries, worries about educational competition and brain drains have led to academic protectionism. India, for instance, places legal and bureaucratic barriers in front of Western universities that want to set up satellite campuses to enroll local students. Perhaps some of the anxiety over the new global academic enterprise is understandable, particularly in a period of massive economic uncertainty. But educational protectionism is as big a mistake as trade protectionism is. The globalization of higher education should be embraced, not fearedincluding in the United States. There is every reason to believe that the worldwide competition for human talent, the race to produce innovative research, the push to extend university campuses to multiple countries, and the rush to train talented graduates who can strengthen increasingly knowledge-based economies will be good for the United States, as well. The word "hand-wringing" (Par
It happens to us all, however hard we may try to delay the process—we grow old. Surgery may remove wrinkles (皱纹), skin which has become less firm may be tightened by a surgical operation on the face, and hair-dressers may dye grey hair a more youthful color, but we cannot remain young forever. Advances in medicine have made it possible for more people to stay alive longer. However, what is important is the quality of life, and people age differently. Some people remain quite well and able to look after themselves when they get old, but others of the same age are not so lucky. They have to go into a nursing home in order to receive adequate care. The worst aspect of ageing is that often the mind becomes less alert. As people grow older, they often experience loss of short-term memory, although they may well be able to recall quite easily events that happened long ago. Later they may suffer from dementia (痴呆), a disease which gets gradually worse. By no means all elderly people are in this category. Many senior citizens are in possession of all their faculties and see retirement as a time of freedom. Not only that, if they have a generous retirement pension, they are likely to be quite well off, with money to spend on holidays and other luxuries. Because of this, both businesses and government have a new respect for what is known as grey power. By no means, however, does everyone treat OAPs with respect. There are some culture which are noted for the great respect with which they treat their old people, but many people in other cultures regard the old people as having a very low status in society and treat them accordingly. They often consider old people as having one foot in the grave. Someone should remind them that they, too, will be old one day. "OAP" (Par
root用户执行ps aux|grep init命令，得到init的PID是（）。A．0 B．1 C．2 D．3
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