若函数f（x）=x+1，(x≥0)f(x+2)，(x＜0)，则f（-3）=___

未按规定配备《油类记录薄》或记载伪造事实，经我国港务监督查实，会处以警告或罚款。

【案例一】 城市公共管理：两种做法两种结果 　　某市政府在城市公共管理方面所采用的两种不同做法，导致了两种不同的结果。 　　一种做法是，该市政府实行市场化取向的改革，将城市废物和垃圾处理的事务交由企业承担。市政府将城市废物和垃圾处理的需求和具体事项，面向社会招标，并详细公告了招标要求与时间，最后通过专家评标，从投标的 20多家企业中选取了 7 家，市政府与 7 家企业签定了合同。这样，就将城市废物和垃圾处理的事务通过招标这种公平竞争的方式由企业具体承担了。实行城市废物和垃圾处理的事务由企业承担之后，政府制定了这类企业在从事废物和垃圾处理业务方面的行为规范、具体规则，并对企业处理废物和垃圾的行为进行监督。通过一年来的实践，城市卫生明显得到了改善，政府在这方面的机构规模因此得到了缩减， 财政开支也减少了。 　　另一种做法是，市政府为了招商引资、实现经济效益与生态效益双丰收，决定利用位于市中心的城市公园兴建一个国际标准的高尔夫球场。这个城市公园，地域广大，湖光山色，是市民们散步、休闲活动的场所，深得市民的青睐。但高尔夫球场建成后，整个公园被铁丝网围起来，只有少数人可以在里面活动；喷洒大量的化学除草剂以抑制杂草，造成了土地和水体的严重污染。高尔夫球场虽然带来了一定经济效益，但引起了市民的强烈不满。

将城市废物和垃圾处理的事务交由企业承担的社会效果是()。

A．有利于保持城市整洁　

B．有利于强化政府管理　

C．有利于扩大社会就业　

D．有利于促进政府职能转变

2012年12月，某旅游开发有限公司经营游览场所取得旅游景点门票收入450万元，在景区内经营旅游观光电车取得收入68万元，支付维修费6万元。该公司上述业务应纳营业税（ ）万元。

A．15.36

B．15.54

C．16.90

D．25.90

密钥管理系统涉及到密钥管理的哪些方面？

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 mantle 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.

More than three decades ago, environmental justice was ().

A. controversial among local activities

B. first proposed by Martin Luther King, Jr.

C. fascinating to the civil rights groups

D. barely realized by many environmentalists