710分大學英語同步水平練與考

內容概要

　　《710分大學英語同步水平練與考（第2版）（4級）》根據國家教育部高教司主持和領導下的大學英語四、六級考試改革項目組和考試委員會制定的《全國大學英語四、六級考試改革方案（試行）》和《大學英語課程教學要求（試行）》，依據全國大學英語四、六級2005年6月考試所采用的710分計分體制來編寫的。該系列與大學英語教學課程和教學要求同步，由淺入深、循序漸進，一學期一冊，共分四級。《710分大學英語同步水平練與考（第2版）（4級）》的難易程度與《全新版大學英語》、《新視野大學英語》、《大學英語》、《新編大學英語》、《21世紀大學英語》、《當代大學英語》和《大學核心英語》等同級教材一致，可作上述教材的同步輔導材料。

書籍目錄

College English Test 1College English Test 2College English Test 3College English Test 4College English Test 5College English Test 6College English Test 7College English Test 8College English Test 9College English Test 10參考答案和高分范文

章節(jié)摘錄

　　In a separate development, all international team of scientists, headed by Gerta Keller of Princeton Univ. in New Jersey, called into question the notion that a massive asteroid strike off the Yucatan peninsula （ in Mexico） was solely responsible for the extinction of the dinosaurs 65million years ago. The researchers, who published their observations in the Proceedings of the National Academy of Sciences, said that new measurements indicate the Chicxulub crater off Mexico was actually created some 300,000 years before the dinosaurs became extinct. The teamargued that the Chicxulub impact event contributed to the extinction, but that a second, as yetun found, impact actually finished off the dinosaurs. Many scientists, however, continue to believe that the Yucatan impact was responsible for the extinction of the dinosaurs on its own.　　Biologists in Japan, led by Tomohiro Ko no of Tokyo Univ. of Agriculture, produced a healthy mouse from two eggs, neither fertilized by a sperm cell, according to their report in Nature April 22. In some species, unfertilized eggs can grow into full animals, a phenomenon called parthenogenesis. This occurs among some insects, fish, birds, and other animals, but never until the work of the Japanese team among mammals. （Unlike in nature aloccurrences of parthenogenesis, the mouse received chromosomes from eggs from two different females. ） Kono and his colleagues inactivated a gene in one of the eggs that contributed to the makeup of the mouse and in doing so, caused the egg to behave more like a sperm cell. The"mouse with two moms" was called Ka guya, after a princess in a Japanese fairy tale. The teamcreated only two healthy mice out of nearly 600 attempts.

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