Most of us agree that there is a moral obligation to minimize the suffering of any captive animals. In addition, there are numerous self-serving reasons why we should respect the welfare of our captive companions. However, the impact of poor animal welfare on the quality of animal science always concerns a scientist the most. Rodents(灵长类动物) make up over 80% of the animals used in scientific procedures, and most are kept in small, barren cages. Such housing is known to constrain normal development, affecting the structure and function of adult rodent brains. These rodents may spend 50% of waking hours performing repetitive activities without apparent purpose. This abnormal behavior is likely to reflect what is going on inside the body. As ethnologist Hanno Wfirbel, of the Justus Liebig University of Giessen, Germany, puts it," The point that the environment might change behavior but it doesn't change biology is ridiculous. Every behavior has a physiological background." If welfare affects behavior, and therefore biology, it will affect scientific outcomes. As long as we continue to treat experimental animals as simple" furry test-tubes", ignoring their abilities and needs, we endanger the quality of the work we do with them. So, how can we improve life for other species when we cannot experience it as they do? We'd better ask the animals. Ask them what they need, and what causes them suffering, through carefully designed preference tests and in-depth behavioural research. Scientists have already begun this task, and have been told some important and unexpected facts by their study subjects. By consistently self-medicating with pain killers, broiler chickens (嫩鸡) have told us that they are in chronic pain. By moving a barrier twice their size, mink (水貂) have told us that water baths are the most important enrichment for them. By only stopping their fruitless stereotypic digging in certain circumstances, gerbils(沙鼠) have told us that they need to be able to sleep in tunneled nest-boxes. By behaving normally again, starlings have told us that they need high frequency light bulbs.
单选题
What are scientists most concerned about according to the first paragraph?
【正确答案】
B
【答案解析】由题干关键词scientist are concerned定位到第一段最后一句：the impact of poor animal welfare on the quality of animal science always concerns a scientist the most(动物福利差对动物科学研究的质量所带来的影响最使科学家担心)，因此本题的正确答案为B。A和D都是一般性的话题，而C项在文中并没有提及。
单选题
What doesn't happen to rodents when they are kept in small, barren cages according to the passage?
【正确答案】
B
【答案解析】根据题干关键词定位到第二段第二、三、四句：Such housing is known to constrain normal development. affecting the structure and function of adult rodent brains. These rodents may spend 50% of waking hours performing repetitive activities without apparent purpose. This abnormal behavior is likely to reflect what is going on inside the body(大家都知道这样的居住条件在影响成年灵长类动物大脑的结构和功能的前提下限制了其正常发育。这些灵长类动物可能把50%的清醒时间花在没有任何目的性重复性行为上。这种非正常行为可能反映了灵长类动物体内的情况)。与上面的陈述对比之后会发现只有B项与之不符，因此为正确答案。
单选题
What is the author's attitude towards the way most experimental animals are treated?
【正确答案】
C
【答案解析】作者在第三段中表明了自己对目前试验用动物的极差的生存环境所州能导致的后果的担心：If welfare affects behavior, and therefore biology, it will affect scientific outcomes. As long as we continue to treat experimental animals as simple "furry test-tubes" ignoring their abilities and needs. we endanger the quality of the work we do with them. (如果生活状况影响行为，进而影响生物性，这也会影响科学结果。只要我们仅仅把试验用动物当作简单的试验器具而忽视他们的能力和需求的话，我们就威胁到了我们在它们身上所进行的工作的质量)。与此处陈述相符的只有C。
单选题
We can detect animals' needs and causes of their sufferings through
【正确答案】
A
【答案解析】根据题干关键词needs和causes of sufferring定位到第四段：through carefully designed preference tests and in-depth behavioural research(通过认真设计的倾向性试验和深入的行为研究)，四个选项中只有A符合，因此为正确答案。
单选题
Which of the following is true about scientists' discovery about animals' needs and sufferings?