单选题  
单选题    
 
【正确答案】 D
【答案解析】[听力原文] The University of Tennessee's Walters Life Sciences Building is a model animal facility, spotlessly clean, careful in obtaining prior approval for experiments from an animal care committee. Of the 15,000 mice housed there in a typical year, most give their lives for humanity. These are 'good' mice and as such won the protection of the animal-care committee. At any given time, however, some mice escape and run free. These mice are 'pests'. They can disrupt experiments with the bacteria organisms they carry. They are 'bad' mice and must be captured and destroyed. Usually, this is accomplished by means of sticky traps, a kind of fly paper on which they become increasingly stuck. But the real point of this cautionary tale, says animal behaviorist Herzog, is that the labels we put on things can affect our moral responses to them. Using stick traps or the more deadly snap traps would be deemed unacceptable for good mice. Yet the killing of bad mice requires no prior approval. Once a research animal hits the floor and becomes an escapee, says Herzog, its moral standing is instantly diminished. In Herzog's own home, there was a more ironic example: when his young son's pet mouse Willy died recently, it was accorded a tearful ceremonial burial in the garden. Yet even as they mourned Willy, says Herzog, he and his wife were setting snap traps to kill the pest mice in their kitchen. With the bare change in labels from 'pet' to 'pest', the kitchen mice obtained totally different moral status. What does the passage say about most of the mice used for experiments? 文章开头提到每年养在实验室的15,000只老鼠中,大部分为人类献出了它们的生命,D选项与此意思一致,故为答案。文章首句虽然出现了spotlessly clean,但该短语是用来形容实验室大楼的,故排除B。
单选题    
 
【正确答案】 C
【答案解析】[听力原文] Why did the so-called bad mice have to be captured and destroyed? 文章中指出,有时,一些老鼠会逃出来四处乱窜,这些老鼠就是“害鼠”。它们由于携带细菌生物会干扰实验,因此这些老鼠就是“坏老鼠”,必须抓住并消灭它们。由此可知,要抓住并消灭“坏老鼠”是因为它们会干扰实验,故答案选C。
单选题    
 
【正确答案】 C
【答案解析】[听力原文] When are mice killed without prior approval? 文中提到杀死“坏老鼠”则不需要经过事先批准。由上一题的分析可知,那些逃跑的老鼠就是“坏老鼠”。由此可知,杀死逃跑的老鼠不需要经过事先批准,故答案为C。
单选题    
 
【正确答案】 A
【答案解析】[听力原文] Why does the speaker say what the Herzogs did at home is ironical? 文中提到在赫佐格家,有更具讽刺意义的一幕:当他儿子的宠物鼠不久前死去时,他们为它在花园举行了一场葬礼。但甚至在他们哀悼宠物鼠时,赫佐格和妻子也在厨房里放了鼠夹以消灭害鼠。A项意思与此一致,故答案为A。