烧伤应激性溃疡的病理特点是()A．胃部病变多发于胃窦、胃大弯及胃底部 B．溃疡数目常

酒鬼酒塑化剂事件引起社会的高度关注。常用塑化剂“DEHP”的化学式为C₂₄H₃₈O₄。它是一种无色透明的液体，不溶于水，溶于大多数有机溶剂，有毒。用作各种塑料制品的工业添加剂，能增加延展性、弹性及柔软度。黑心业者为了牟取暴利将其添加到多种饮料、果冻、果酱和方便面等食品中。若长期食用此类食品可能对生殖系统、免疫系统造成伤害，大量摄入还可能致癌。根据上述信息回答下列问题：

（1）写出塑化剂“DEHP”的一条以上物理性质         。

（2）塑化剂“DEHP”属于         （选填“单质、氧化物、化合物”中合适的一项）。

（3）一个“DEHP”分子中，氢原子和氧原子的最简个数比为      。

（4）塑化剂“DEHP”中H元素与O元素的质量比为          。（最简整数比）

（5）针对频频发生的食品安全问题，有人认为化学物质是这些问题的罪恶之源。你认为正确的观点是                                                      。

△ABC的三边长分别为3、4、5,P为平面ABC外一点,它到三边的距离都等于2,则P到平面ABC的距离为__________.

For the past year, the World Food Program has operated a project to prevent hunger in twenty-one countries in Africa. In the project, the United Nations agency works with small farmers to grow more and better produce.

The World Food Program buys the produce through local cooperative associations. Then it distributes the products within the country or area. The project works mainly with women. Sheila Sisulu from the World Food Program says the project aims to break a cycle that keeps people hungry. The situation is that farmers have to sell their produce at low prices after harvest, when supplies are greatest. Then they have to pay high prices to buy food for themselves during the "lean season," when supplies are limited.

But when farmers produce more food, they can sell more. And when they produce high-quality food, they can get higher prices. They can also store food for themselves, and have enough money to buy food if they need to during the lean season. Sheila Sisulu says the farmers are now starting to earn profits through the project.

The Food and Agriculture Organization and the International Fund for Agricultural Development help the farmers choose the best seeds and fertilizers. They also advise the farmers on the quality levels that the World Food Program requires to buy their produce.

Two other groups recently launched a separate effort to increase food security in Africa. The groups are the Alliance for a Green Revolution in Africa and the New Partnership for Africa's Development. They say African governments have to increase their investment in agriculture in order to fight problems related to climate change. The groups want the governments to develop programs in seeds, soil health, policy and markets.

Former United Nations chief Kofi Annan is the chairman of AGRA. The group's president, Namanga Ngongi, says many African governments are not meeting a target of spending ten percent of their national budgets on agriculture. But he says investment has risen from four percent of national budgets to probably five and a half percent today.

1. The underlined word “lean” in Paragraph 2 probably has the same meaning with ______.

A. He is a tall, lean and handsome boy, liked by many girls.

B. The changes made the company leaner and more competitive.

C. The company recovered well after going through several lean years.

D. The doctor told him that lean meat was healthier for his mother than fatty meat.

2. According to Sheila Sisulu, the project _____.

A. distributes the products within the whole world

B. has benefited few African farmers during the past year

C. enables the African farmers to sell their produce at low prices after harvest

D. can help the farmers to get away from the situation that keeps them hungry

3. The problem of hunger in Africa can possibly be relieved by ______.

A. United Nations chief

B. the World Food Program

C. African governments and farmers

D. the Food and Agriculture Organization

4. Which can be the best title?

A. Hunger, the most serious problem in Africa      

B. Two efforts seek to increase food security in Africa

C. A project to grow more and better produce in Africa

D. More investments in agriculture by African governments

组织行为学的多层次相交切性主要表现为（）

A.三层

B.四层

C.五层

D.六层

关于肺炎链球菌，叙述正确的是（）

A.具有荚膜结构

B.能产生强烈的外毒素

C.能产生强烈的内毒素

D.不产生溶血素

E.主要引起心内膜炎