单选题的值为______。A．100B．-100C．-102D．102

单选题某公司参加一次植树活动，平均每人要植树6棵．若只有女员工完成，每人应植树10棵；若只有男员工完成，每人应植树______棵．

单选题若，则sec2θ+csc2θ=______。A．B．C．D．

单选题在数列an中，若数列前n项和为()．

单选题有无穷多解，则a=()。

单选题 The most effective attacks against globalization are usually not those related to economics. Instead, they are social, ethical and, above all, cultural. These arguments surfaced amid the disturbance of Seattle in 1999 and have resonated (产生反响) more recently in Davos, Bangkok and Prague. They say this. The disappearance of national borders and the establishment of a world interconnected by markets will deal a death blow to regional and national cultures, and to the traditions, customs, myths and mores that determine each country's or region's cultural identity. Since most of the world is incapable of resisting the invasion of cultural products from developed countries--or, more to the point, from the superpower, the United States--that inevitably trails the great transnational corporations, North American culture will ultimately impose itself, standardizing the world and annihilating its rich flora of diverse cultures. In this manner, all other peoples, and not just the small and weak ones, will lose their identity, their soul, and will become no more than 21st century colonies modeled after the cultural norms of a new imperialism that, in addition to ruling over the plant with its capital, military strength and scientific knowledge, will impose on others its language and its ways of thinking, believing, enjoying and dreaming. Even though I believe this cultural argument against globalization is unacceptable, we should recognize that deep within it lies an unquestionable truth. This century, the world in which we will live will be less picturesque and filled with less local color than the one we left behind. The festivals, clothing, customs, ceremonies, rites and beliefs that in the past gave humanity its folkloric and ethnological (民族的) variety are progressively disappearing or confining themselves to minority sectors, while the bulk of society abandons them and adopts others more suited to the reality of our time. All countries of the earth experience this process, some more quickly than others, but it is not due to globalization. Rather, it is due to modernization, of which the former is effect, not cause. It is possible to feel deep sorrow, certainly, that this process occurs, and to feel nostalgia (怀旧) for the past ways of life that, particularly from our comfortable position of the present, seem full of amusement, originality and color. But this process is unavoidable. In theory, perhaps, a country could keep this identity, but only if like certain remote tribes in Africa or the Amazon--it decides to live in total isolation, cutting off change with other nations and practicing self-sufficiency, a cultural identity preserved in this form would take that society back to prehistoric standards of living. It is true that modernization makes many forms of traditional life disappear. But at the same time, it opens opportunities and constitutes an important step forward for a society as a whole. This is why, when given the option to choose freely, peoples, sometimes counter to what their leaders or intellectual traditionalists would like, choose for modernization without the slightest ambiguity.

单选题本根铁丝，先截下它的又截下原长的结果两根相差0.5m，这根铁丝原来的长度为()m。

单选题已知不等式ax2+bx+a＞0的解集为，则a，b应满足______

单选题Although Lucy was slimming, she found cakes quite ______. A. irremovable B. irresistible C. irrefutable D. irrepressible

单选题如果一组数据5,-2,0,6,4,x的平均数为3，那么x等于( )．

单选题如图所示，正方形ABCD的边长为4，分别以A，C为圆心，4为半径画圆弧，则阴影部分面积是______．

单选题设a，b，c是三个不同的正实数，若，那么______

单选题双曲线虚轴的一个端点为M，两个焦点为F1与F2．设∠F1MF2=120°，则该双曲线的离心率为()．

单选题设商品销售量x对价格p的函数为x=a-bp，a，b正常数，若涨价可以增加收入，则应有______。A．B．C．D．