在面向对象方法中，属性与操作相似的一组对象称为 【2】 。

患者男性，54岁，因"硫酸烧伤"来诊。患者工作时不慎被管道中喷出的硫酸烧伤躯干及双上肢、右下肢，总面积约39%。伤后1周由外院转入。查体：体温36.5℃，脉搏78次/分，呼吸22次/分，血压118/60mmHg（1mmHg=0.133kPa）。创面散在于躯干及四肢，为黑色焦痂，干燥。

提示：患者于术后第3天出现高热。需要完善的检查有（）

A.胸部X线片

B.创面组织细菌培养

C.深静脉导管标本的细菌培养

D.创面愈合中的正常现象，可不予处理

E.尿液分析

F.完善病史及进一步查体

基因型是AA和aa的亲体进行杂交，受精卵的基因型是[ ]

A．AA

B．aa

C．Aa

D．以上三者都对

Studies show farmland in Africa is often lacking in important nutrients. But researchers say combining different farming methods may help.

Since the world food crisis several years ago, researchers have directed more of their attention to small farms. Most farms in areas south of the Sahara Desert are only about one or two hectares. One of the goals is to increase production without necessarily clearing more land to grow additional crops. 

American researchers say that can happen with greater use of an agricultural system called perennation. It mixes food crops with trees and perennial plants – those that return year after year.

Mr. Reganold, who is with Washington State University, says poor soil may have resulted from years of weathering that washed away many nutrients. He says some farmers may have done more harm than good.

He estimates that up to two billion dollars worth of nitrogen, phosphorous and potassium is lost from African soil each year.

The scientist says the word perennation defines three systems that are already used in Africa. The oldest of the three is called evergreen agriculture. This is where farmers plant trees with their crops. John Reganold says farmers in Africa have been doing this for sixty years, but it seems to be growing in popularity.

The method is gaining widespread use in countries such as Niger, Burkina Faso, Malawi and Zambia. The trees are planted among maize, millet or sorghum crops. They not only add nitrogen to the soil through their roots, but also through their leaves when they fall off and break down. At other times of the year, the trees can protect plants from strong sunlight.

Mr. Reganold was one of three researchers who wrote a report about perennation. It was published in the journal Nature.

小题1:Farmland in Africa ________.

A．is often small in size

B．can produce more than enough crops for Africans

C．is short of important nutrients

D．has got the attention of scientists around the world小题2:Researchers focused their attention on small farmlands for the reason that ________.

A．Africa was going through a food crisis

B．most farms in areas south of the Sahara Desert are small

C．there are not enough farmlands

D．farmers may grow additional crops on farmland小题3:The word“perennation”mentioned in this passage ________.

A．is a farming method of planting food crops with trees

B．is a new farming method

C．can help African people produce more food than they need

D．is gaining widespread use around the world小题4:We can infer from the passage that ________.

A．perennation will be widely used by farmers in Africa

B．American government will help African countries increase food production

C．African countries is short of farmland

D．some farmers are destroying their farmland in Africa on purpose小题5:This report is mostly likely to be a journal of ________.

A．food

B．environment

C．agriculture

D．gardening

His strength had almost ____  when they found him in the desert.  [ ]

A. given out    

B. given in  

C. given up    

D. given off

一
案情：李富裕与杨伟民于2002年1月28日签订了一房屋租赁合同，租金每月1500元，租期为一年，但只是口头约定，未采用书面形式。李富裕住进去后发现，外面下大雨的时候，房屋经常漏水，便通知杨伟民修理。但杨迟迟未予修理。李富裕只好自己出钱维修，并在修好的房屋旁边新建了一小仓库，以堆放杂物。但这些行为并未通知杨伟民。2002年9月28日，杨伟民欲将房屋收回，要求解除房屋租赁合同。李富裕以租赁期未到期为由，拒绝搬出。2002年 10月1日，李富裕因公出差，将房屋转租给其表弟居住，租金2000元，杨伟民表示反对。在李富裕出差期间，杨伟民将房屋赠与其侄女杨红，但因工作忙未办，理房屋登记手续。2002年11月1日，李富裕回到家中。杨红通知他说要开一小卖店要求李搬走，李辩说租赁合同是他与杨伟民签订的，与杨红没有关系。杨红遂拿出赠与合同证明房屋现在归她所有。
问题：
1.本案包含哪几种法律关系