复旦大学2002年考博英语试题.pdf

大量考研考博试题大量考研考博试题 QQ ：：429644083 大量考研考博试题大量考研考博试题 ：： 复旦大学复旦大学博士研究生入学考试试题年博士研究生入学考试试题 复旦大学复旦大学博士研究生入学考试试题年博士研究生入学考试试题 Paper One  Part Ⅰ Listening (15%) （略） Part Ⅱ Reading Comprehension (30%) Directions: There are 4 reading passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A., B., C. and D.. You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the centre. Passage 1  One of the greatest mysteries in the study of Cetacea ［aquatic mammals］ has always been that the creatures found in the stomachs of toothed whales show no teeth marks. Now a University of California at Santa Cruz professor thinks he may have solved the enigma with what he calls the “big bang” theory of cetacean predation. Ken Norris, natural history professor, believes that rather than use their teeth to attack their victims, toothed whales stun their prey with intense bursts of sound. He points out that all 68 species of odontocetes (a sub-order that includes dolphins) use sound to locate their victims, and suggests this ability may have evolved to the point where it could be used as a weapon. Millions of years ago, the ancestors of whales had a narrow tapered jaw, streamlined for speed and bristling with long rows of sharp teeth. Today odontocetes are not adapted to surprising their prey or trapping it quickly. Most are more bulky than their forebearers; their teeth are short and unevenly spaced when they exist at all. Norris suggests that because of their sonar ability, whales teeth have become vestigial, like the human appendix. It is difficult to test the big bang theory because in captivity, cetaceans tend to moderate their sonar so as not to deaf