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Have you ever felt like you would do just about anything to satisfy your hunger? A new study in mice may help to explain why hunger can feel like such a powerful motivating force. (16)In the study, researchers found that hunger out weights other physical drives including fear, thirst and social needs. To determine which feeling won out, the researchers did a series of experiments. In one experiment, the mice were both hungry and thirsty. When given the choice of either eating food or drinking water, the mice went for the food, the researchers found. However, when the mice were well-fed but thirsty, they opted to drink according to the study. In the second experiment, meant to pit the mice’s hunger against their fear, hungry mice were placed in a cage that has certain fox scented areas and other places that smell safer; in other words, not like an animal that could eat them but also had food. (17)It turned out that when the mice were hungry, they ventured into the unsafe areas for food. But when the mice were well-fed, they stayed in the area of the cage that were considered safe. Hunger also out weights the mice’s social needs, the researchers found. (18)Mice are usually social animals and prefer to be in the company of other mice according to the study. When the mice were hungry, they opted to leave the company of other mice to go get food.

未听先知

预览三道题各选项,由 investigate和反复出现的mce可推测,短文内容与拿老鼠做实验有关。第 16题各选项均为不定式结构,考查实验的目的;第17题各选项均为表示时间的句子,考查老鼠做某事的时间;第 18题各选项都是描述喜好的句子,考查老鼠的习性。

详解详析

16: What is the researchers’ purpose in carrying out the series of experiments with mice?

B)【精析】 细节推断题。短文指出,对老鼠的一项新的研究解释了为什么饥饿是强大的动力源泉,饥饿战胜了其他身体本能的需求,包括恐惧、口渴和社交需求。为确定哪种感觉的影响更胜一筹,研究人员做了一系列的实验。


17: In what circumstances do mice venture into unsafe areas?

A)【精析】 事实细节题。短文指出,在第二个实验中研究者把老鼠的饥饿与恐惧作对照研究,结果表明,当老鼠饿了的时候,它们会冒险进入不安全的地方寻找食物。


18: What is said about mice at the end of the passage?

C)【精析】 细节推断题。短文末尾提到,老鼠通常是群居动物,喜欢成群结伴,但饥饿会使他们离开群体觅食。