题目

(本小题满分15分)设函数在上是增函数，在上是     减函数，且方程有三个实根．     (Ⅰ)求的值；     (Ⅱ)试比较与的大小，并说明理由； (Ⅲ)求的取值范围． 答案：答案 （Ⅲ）由条件可得：                     ………1分  ∴                       ………1分  ∴，即,                    ………1分  ∴,      ………1分 ∴．                                                        ………2分　　阅读理解：阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项． 　　BEIJING, May 11(xinhuanet)-Vice-Premier and Health Minister Wu Yi, on behalf of the State Council, China's cabinet, Sunday sent a congratulatory message conveying(表达)her great respect to the country's medical workers, especially nurses, on the occasion of international Nurses' Day. 　　The holiday was established to commemorate(纪念)the birthday of Florence Nightingale, an English woman born in 1820, who is widely considered the founder of modern nursing. 　　In an open letter to the country's nurses, Wu said nursing work has always been associated with the spirit of humanitarianism(人道主义)and that nurses have won the public's respect and admiration since Florence Nightingale founded the profession(职业) nearly a century ago. 　　In China, nursing has become an important part of the country's public health cause, and as of the end of 2002, China had a total of nearly 1.25 million nurses, accounting for 29.2 percent of the country's medical workers, the letter says. 　　Bearing in mind the tenet (宗旨) of serving the people whole-heartedly, the country's nurses have worked hard and earnestly(认真地) for years, making great contributions to the development of China's public health cause, Wu said. 　　Especially during the ongoing fight against severe acute respiratory syndrome (SARS), the nurses have firmly placed the public's health and lives first, carrying out their duties day and night to care for the patients. Their professionalism and spirit have earned them praise, respect and trust from the people, Wu said. 　　The Party Central Committee and the State Council have always attached great importance to SARS prevention work and to the health of medical workers across the country and have high praise for their performance. 　　The letter described the comments and praise as great encouragement and support for the medical and health workers. 　　The letter called on medical workers across the country to continue their efforts to prevent and control the disease as the SARS situation is still very serious. 　　Wu expressed confidence that China will ultimately (最后) defeat SARS. 1．How many medical workers does China have? [　　] A．Less than 5 million.B．About 3.3 million. C．A little over 4 million.D．About over 4 million. 2．Why does Wu Yi send this congratulatory message to medical workers? [　　] A．To commemorate the birthday of Florence Nightingale. B．To show her respect to them and call for more efforts to fight against SARS. C．To tell the nation about the medical workers' achievements for China's public health. D．To show the government has always attached great importance to SARS. 3．What does the underlined word “cause” in the fourth paragraph probably mean? A．理由B．部分 C．事业D．成就 4．The passage probably comes from________. [　　] A．a medical report B．an opening speech at a ceremony C．the Internet D．a news broadcast on TV