Tham khảo tài liệu 'kỳ thi thử đại học lần 1 năm học 2010 - 2011 môn: tiếng anh - mã đề thi 108', tài liệu phổ thông, ôn thi đh-cđ phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Trường THPT Lê Quảng Chí KỲ THI THỬ ĐẠI HỌC LẦN 1 Năm học 2010 - 2011 ----o0o---- Môn Tiếng Anh Thời gian làm bài 90 phút 80 câu trắc nghiệm Họ tên thí sinh . Số báo danh . Mã đề thi 108 Questions 1 - 10 Read the following passage carefully and then choose the best answer to each question. For many years scientists have speculated that the cataclysmic impact of an asteroid with the earth was responsible for the demise of the dinosaurs approximately 65 million years ago. Previous discoveries and results have hinted that an asteroid two kilometers in diameter struck the Yucatan peninsula in Eastern Mexico. This impact stronger than one thousand nuclear explosions is speculated to have cast a cloud of dust and debris into the atmosphere covering the entire surface of the earth and blocking out the sun and consequently lowering the surface temperature of the earth. With such a radical change in the earth s environment scientists believe that over 90 of all animal and plant species were eradicated. Only after millions of years did plants and animals even begin to recover. But the reign of the dinosaurs had ended and the age of mammals had begun. The crucial link that has held this theory together has been the element iridium. Iridium is not commonly found on either the surface of the earth or inside the crust. It is more commonly found in asteroids or meteorites throughout the solar system. Scientists have hypothesized that after the asteroid impacted the earth an even layer of iridium sediment settled over the global and eventually became part of its surface. The theory of course has depended on the discovery of such an existing layer of iridium. Unfortunately scientists have never been able to offer absolute proof that this asteroid impact ever occurred. Recently however a discovery may go a long way toward validating these scientists theories. In 1996 a team of marine biologists excavated samples of rock from the floor of the Atlantic Ocean just off the coast of .
