题目

阅读理解 There is no need to head to the movie theater or download the video game app: Angry Birds can be found right in your backyard this summer—if you live in the suburb(市郊). Virginia Tech researchers recently find that birds that live in suburban areas exhibit significantly higher levels of anger than those living in country. The results were recently published in Biology Letters. "A possible reason for this is that these birds have less space but better resources to defend," said Scott Davies, an expert at biological sciences in the College of Science. "Living near humans provides better food and shelter, but it also means more competition for these limited resources." The Virginia Tech and Radford University campuses served as the suburban sites due to their levels of human impact. Rural(乡村的) sites included Kentland Farm and Heritage Park. In these settings, the researchers played a recording of a male song sparrow(歌雀) and observed how the birds responded to a simulated(仿造的) intrusion from a neighbor. Campus birds showed a higher level of aggression: they approached and remained near the speaker, beat their wings wildly, engaged in loud singing and then began to produce ‘soft song'—a term that researchers use to describe the quiet noise that a bird makes, which indicates an attack is to be launched soon. Though rural birds still responded to a song intrusion, they did not respond as vigorously. The researchers placed small leg bands on the birds to identify individuals, and recorded each individual's responses twice, several weeks apart. The suburban birds reacted more fiercely on both occasions, showing that their increased aggression persists throughout a breeding season. （1） The study by Virginia Tech researchers suggests that ________. A . there are more angry birds in suburban areas than in rural areas B . angry birds prefer to live in suburban areas instead of in country C . birds living in suburban areas tend to show a higher level of anger D . birds in rural areas prefer to live near humans for food and shelter （2） The researchers measured the level of different birds' aggression by ________. A . recording the reactions of song sparrows to their neighbors' intrusion B . placing small leg bands on the birds to identify different individuals C . observing the birds' responses to a recording of male song sparrows D . approaching the birds in order to listen to their soft and quiet songs （3） The underlined word "vigorously" in paragraph 5 is closest in meaning to ________. A . mildly B . violently C . helplessly D . gently （4） The purpose of the passage is to ________. A . argue and persuade B . compare and assess C . discuss and examine D . inform and explain 答案： C C B D

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