小均用动滑轮将质量为40kg的货物匀速提高了5m ，他用250N的拉力拉了10s

女，71岁，左肩痛，系统性红斑狼疮服用高剂量的类固醇半年，结合图像，最可能的诊断是（）.

A.化脓性关节炎

B.类风湿关节炎

C.骨纤维肉瘤

D.肱骨头缺血坏死

E.肩关节结核

现代教育的本质特征对现代教育管理制度的内在规定性。

临床上，一旦房颤患者的心室律变得规则，应考虑哪些可能性

A．恢复窦性心律

B．房扑及固定的房室传导比率

C．房性心动过速

D．如心室律变慢而规则，提示完全房室传导阻滞

E．出现Ⅱ度I型房室传导阻滞

若进栈序列为1，2，3，4，进栈过程中可以出栈，则下列不可能的一个出栈序列是________。

A．1，4，3，2

B．2，3，4，1

C．3，1，4，2

D．3，4，2，1

Human and the Environment

One of the most pressing challenges that the United States and indeed the world will face in the next few decades is how to alleviate (减轻点)the growing stress that human activities are placing on the environment. The consequences are just too great to ignore. Wildlife habitats (栖息地)are being degraded(使退化) or disappearing altogether as new developments take up more land. (46) As many as 30 percent of the world’s fish stocks are over-exploited. And the list goes on.
(47) Advances in computing power and molecular biology(分子生物学) are among the trem endows increases in scientific capability that are helping researchers gain a better understanding of these problems. Recent developments in science and technology could provide the basis for some major, and timely(及时的) actions that would improve our understanding of how human activities affect the environment.
One priority for research is improving hydrological(水文学的)forecasting. (48) Already, widespread water shortages have occurred in parts of China, India, North Africa, and the Arabian Peninsul

• a. The need for water also is taking its toll (造成损失)on freshwater(淡水)ecosystems (生态体系)in the United States. Only 2 percent of the nation’s streams are considered in good condition, and close to 40 percent of native fish species are rare or extinct. Using a variety of new remote sensing tools scientists can learn more about how precipitation(降水量)affects water levels, how surface water is generated and transported, and how changes in the landscape affect water supplies.
  To prevent outbreaks of infectious(传染性的)diseases in plants, animals, and humans, more study is needed on how pathogens (病原体), parasites(寄生生物), and disease-carrying species-as well as humans and other species they infect-are affected by changes in the environment. (49) Researchers can take advantage of new technologies in genetics and computing to better monitor and predict the effects that environmental changes might have on disease outbreaks.Humans have made changes to earth’s surface, such as tropical deforestation(砍伐森林), reduction of surface and ground water, and massive development, so dramatic that they approach the levels of transformation that occurred during glacial periods(冰川期). (50) Recent advances in data collection and analysis should be used to record and better understand the causes and consequences of changes in land cover and use.A. It has been estimated that the world’s water use could triple in the next two decades.B. Plant and animal species are becoming extinct at a greater rate now than at any time in earth’s history.C. The overuse of antibiotics (抗生素) both in humans and in farm animals has contributed to the growth of antibiotic resistant micro-organisms (微生物).D. Yet, there is reason to have hope for the future.E. Until recently, very little information was documented about changes and consequences of land usage.F. Such changes cause changes in local and regional climate, and will determine the future of agricultur