Section B
Passage One
How much living space does a person need? What happens when his space requirements are not adequately met? Sociologists and psychologists are conducting experiments on rats to try to determine the effects of overcrowded conditions on man. Recent studies have shown that [26]the behavior of rats is greatly affected by space. If rats have adequate living space, they eat well, sleep well, and reproduce well. However, if their living conditions become too crowded, their behavior pattern and even their health perceptibly change. They cannot sleep and eat well, and signs of fear and tension become obvious. [27]The more crowded they are, the more they tend to bite each other and even kill each other. Thus for rats, population and violence are directly related. Is this a natural law for human society as well? [28]Is adequate space not only desirable, but essential for human survival?

Questions 26 to 28 are based on the passage you have just heard.
26. What affects rats' behavior?
正確答案：C
解析：聽到“最近研究表明：鼠類行為受空間影響頗大”，可判斷C（空間）正確。
27. What effect may inadequate living space have on rats according to the passage?
正確答案：B
解析：原文說(shuō)，空間越擁擠，老鼠就越容易相互撕咬和殘殺，故B正確。A、C是積極健康的行為，而B、D則是不健康的行為。根據(jù)本文主題也可排除A、C，短文也未提及“自殺”，可排除D。
28. What is the experiment done on rats intended to prove?
正確答案：C
解析：短文介紹了有關(guān)老鼠的實(shí)驗(yàn)后提出，對(duì)老鼠而言，老鼠數(shù)量和暴力之間具有直接的關(guān)系。作者進(jìn)而問(wèn)道：這是否也適用人類社會(huì)？足夠的空間是否也是人類生存所必需的條件？故對(duì)老鼠的研究是為人類服務(wù)的，C正確。