大学英语视听阅读4文章概括.docx

U1 In the 1800s, the Rocky Mountain locust brought massive destruction to western settlers. Then, the insects suddenly disappeared---almost without a trace. Now scientists hope to find a reason for the locust’s extinction. What caused the Rocky Mountain locust to disappear? A scientist, Dr. Lockwood finds the answer. He spent over a decade investigating. He explains that it was humans who were in fact responsible for the extinction of the Rocky Mountain locust. More and more farms appeared in the river valleys to feed the miners. For working on the land, the farmers plowed up the fields and thereby stamped out the delicate eggs that had been laid by the great swarm. By not allowing the eggs to mature into full-grown locusts, the species was entirely destroyed when it was at its weakest when the insects were just eggs. The only extinction of a pest species in agricultural history was in fact an accident. 落基山脉的蝗虫给西方殖民者带来了巨大的破坏. 然后，昆虫突然消失了---几乎没有一个痕迹. 什么导致了落基山山脉蝗虫的灭绝？一位科学家，DR.找到了答案。他花费了十多年的时间调查。他解释道是人类是落基山蝗虫灭绝负责。随着越来越多的农场出现在河谷中。在工作过程中的土地上，农民耕种的田地，从而杜绝了因大群奠定了精致的蛋。在那些未孵化的卵是落基山蝗虫的最后一代人。通过不让鸡蛋成熟到完全成熟的蝗虫，该物种被完全摧毁时，它是在其最弱的时候，昆虫只是鸡蛋。在农业历史上唯一的一个害虫物种灭绝，实际上是一个事故。 U2 Humboldt squids, or “Red devils”, are some of the world’s largest animals without a backbone. These sometimes dangerous creatures live in the deep waters of Pacific Ocean. They are fierce enough to attack sharks, and when disturbed or threatened, they’ve been known to be aggressive toward deep-sea divers. A researcher，Gilly and a professional diver have come to the Gulf of California to learn more about them. They have done an interesting experiment: filming the squid using red light. They observed how the red devils hunt their prey: They’re coming in at full speed ahead, grab the prey, and full speed reverse. And leave the link. They have incredible intelligence. Seeing the attack behavior of the Humboldt squid has helped Gilly to further understand something important about creatures that he’s studied for so many