第二部分：阅读理解（共20 小题。第一节共15 小题，每题2分；第二节共5 题，每题2分；共40 分） 阅读下列短文，从每题所给的四个选项  A．B．C．D中选出最佳选项。 A Unnoticed and unappreciated for five decades，a large female turtle （龟）with a stained（彩色的），leathery（粗而硬的） shell is now a precious commodity（物品）in Changsha’s old zoo．She is fed on a special diet of raw meat．Her small pool has been covered with glass which can defend it from bullets．A special camera monitors her movements．A guard is posted at night． The purpose is simple：the turtle must not die． Earlier this year，scientists concluded that she was the planet’s last known female Yangtze giant soft shell turtle．She is about 80 years old and weighs almost 90 pounds． As it happens，the planet also has only one known male．He lives at a zoo the city of Suzhou．He is 100 years old and weighs about 200 pounds．They are the last hope of saving a species believed to be the largest freshwater turtles in the world． “It’s a very dangerous situation,” said Peter Pritchard, a famous turtle expert in the United States，who has helped try to save the species．、 For many Chinese people，the turtle is the symbol of health and long life，but the last two Yangtze giant soft-shell creatures show the threatened state of wildlife and biodiversity（生物多样性）in China．Pollution, hunting and over development are destroying natural habitats，and also endangering the plant and the animal population． China contains some of the world’s richest treasures of biodiversity, yet the latest major survey of plants and animals shows a discouraging picture．Nearly 40 percent of all mammal species in China are now endangered, Scientists say．For plants，the situation is worse；70 percent of all nonflowering plant species and 86 percent of flowering species are considered threatened． 46．Why is the turtle in Changsha specially cared? A．She has been unnoticed and unappreiated five decades． B．She can be sold at a high price． C．She is the planet’s last known female Yangtze giant soft-shell turtle． D．She is old and heavy． 47．Which of the following statements is TRUE according to the text? A．The turtle in Changsha is precious because it is the symbol of health and long life． B．Peter Pritchard believes the female turtle is the largest freshwater turtle in the world． C．The female turtle is in a dangerous situation where she may be killed． D．The female turtle in Changsha and the male turtle in Suzhou are the last hope of saving the largest freshwater turtle species in the world． 48．According to the text ________in China． A．there are the richest species of living things B．wild plants and animals are becoming fewer C．turtles are specially protected D．the situation of plants is better than that of mammal species 49．The last paragraph proves the threatened state of wildlife and biodiversity in China by__________ ． A．facts and numbers                      B．Peter Pritchard’S words C．teaching theory                        D．telling a story