题目

下列命题中，真命题是（ ）A. 对角线互相垂直且相等的四边形是菱形B. 对角线互相垂直的平行四边形是菱形C. 对角线互相平分且相等的四边形是菱形D. 对角线相等的四边形是菱形 答案：【答案】B【解析】试题分析：A．不能判断是否为菱形，故A错误；B．对角线互相垂直的平行四边形是菱形，正确；C．对角线相等且互相平分的四边形是矩形，故C错误；D．不能判断是否为菱形；故D错误；故选B．Rachel Carson was born in the USA in May, 1907. Her mother, Maria Carson, had been a schoolteacher. She also loved nature. She showed Rachel the beauty of nature. She also taught Rachel a deep love for books. As a quiet child, Rachel liked to read and write stories. At a very early age, she decided she wanted to be a writer some day. Her story first appeared in a children's magazine when she was ten years old.Her first book, Under the Sea Wind came out in 1941. In 1948, Miss Carson began working on another book, The Sea Around Us. She always researched carefully when she wrote. She collected information from more than one thousand places to write The Sea Around Us. When the book came out in 1951, it won the National Book Award. It was No.1 on the best?seller list for more than a year. The Sea Around Us made Rachel Carson famous.Rachel Carson's most famous book, Silent Spring came out in 1962. In this book, she pointed out that the use of some kinds of pesticides(杀虫剂) like DDT would cause the number of birds to decline because it would kill them as well. Finally, in November 1969, the United Sates government decided that the use of DDT must stop in two years.Rachel Carson has been regarded as a great environmentalist (环保主义者) and writer. She will be remembered by the world.1.Rachel Carson had a deep love for nature and books because of ________．A. her fatherB. her motherC. her schoolteacherD. her brother2.Rachel decided that she wanted to be a writer when ________．A. she was very youngB. she was in collegeC. she became a teacherD. she became famous3.The Chinese meaning of the word “decline” in this passage is probably “________”．A. 增加 B. 减少 C. 维持 D. 翻番4.Which of the following is NOT true according to the passage?A. Rachel Carson was a careful and serious writer.B. The Sea Around Us won the National Book Award.C. In Silent Spring Rachel said some pesticides were bad for the environment.D. The use of DDT was stopped as soon as the book Silent Spring came out. 1.B 2.A 3.B 4.D 【解析】试题分析：短文大意：这篇短文主要介绍了美国著名的环保主义者——蕾切尔卡森的生平事迹。并重点介绍了她写得关于环保的两本书，在其中一本书出版两年后美国政府终于终止了杀虫剂DDT的使用。 1. 2. 3. 4.