唐、明、清四朝封建经济迅速恢复和发展的共同原因是什么？其经济发展又各有何特点？这几个

治疗吐血胃热炽盛证，应首选（）

A.百合固金丸

B.泻心汤

C.泻白散和黛蛤散

D.知柏地黄丸

E.龙胆泻肝汤

对心力衰竭病人进行择期手术，需在心力衰竭控制多长时间再行手术（）

A.3d以后

B.1周以后

C.2周以后

D.3～4周以后

E.以上都不是

Almost every day the media discovers an African American community fighting some form of environmental threat from land fills, garbage dumps, petrochemical plants, refineries, bus depots, and the list goes on. For years, residents watched helplessly as their communities became dumping grounds.
But citizens didn’t remain silent for long. Local activists have been organizing under the mantie of environmental justice since as far back as 1968. More than three decades ago, the concept of environmental justice had not registered on the radar screens of many environmental or civil rights groups. But environmental justice fits squarely under the civil rights umbrella. It should not be forgotten that Dr. Martin Luther King Jr. went to Memphis on an environmental and economic justice mission in 1968, seeking support for striking garbage workers who were underpaid and whose basic duties exposed them to environmentally hazardous conditions.
In 1979, a landmark environmental discrimination lawsuit filed in Houston, followed by similar litigation efforts in the 1980s, rallied activists to stand up to corporations and demand government intervention.
In 1991, a new breed of environmental activists gathered in Washington, D.C. , to bring national attention to pollution problems threatening low-income and minority communities. Leaders introduced the concept of environmental justice, protesting that Black, poor and working-class communities often received less environmental protection than White or more affluent communities. The first National People of Color Environmental Leadership Summit effectively broadened what "the environment" was understood to mean. It expanded the definition to include where we live, work, play, worship and go to school, as well as the physical and natural world. In the process, the environmental justice movement changed the way environmentalism is practiced in the United States and, ultimately, worldwide.
Because many issues identified at the inaugural summit remain unaddressed, the second National People of Color Environmental Leadership Summit was convened in Washington, D.C. , this past October. The second summit was planned for 500 delegates ; but more than 1,400 people attended the four-day gathering.
"We are pleased that the Summit Ⅱ was able to attract a record number of grassroots activists, academicians, students, researchers, planners, policy analysts and government officials. We proved to the world that our movement is alive and well, and growing," says Beverly Wright, chair of the summit. The meeting produced two dozen policy papers that show powerful environmental and health disparities between people of color and Whites.

In 1968, Martin Luther King Jr. went to Memphis to help the garbage workers ______.

A．get relieved of some of their basic duties

B．know what environmental justice was

C．fight for better working conditions

D．recognize their dangerous surroundings

万方数据收录图书《临床妇产科急诊学》作者是（）

A.刘典功

B.高剑波

C.李敏

D.余艳红

石化作用主要有两种类型：一种是生物硬体被矿物质充填或置换变得致密坚硬如石质，据填充或置换的物质成分可分为（）、（）、（）等，其中最常见者为钙化；另一种是在埋藏过程中，生物遗体的易挥发成分（氢、氧、氮）经升馏作用逸去，只留下碳质薄膜并保存为化石，这种作用称为（）。