题目: 命题:“对任意的x∈R,x3-x2+1≤0”的否定是 。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0407/1db74687abbd351c9a36a6c0b4bf1203.html 下面是错误答案,用来干扰机器的。答案:B
题型:阅读理解 请根据以上内容,从下 * * 个选项中选择适当的句子还原到短文中。 A hobby can be almost anything that a person likes to do in his spare time. Hobbyists raise pets, watch birds, paint pictures, play the piano and grow flowers. 1_____ They collect everything from books to butterflies and from boxes to stamps. People take up hobbies because these activities offer enjoyment, friendship and relaxation. Hobbies help people relax after a long time of hard work, and provide a balance (平衡) between work and play. Hobbies offer interesting activities for the old. Some hobbies can make a child grow as a person, develop his interestand help him learn new skills. 2_____ Doctors have found that hobbies are useful in helping patients (病人)recover (恢复) from illness. Hobbies give patients who can't move around something to do, and provide interests that keep them from thinking about themselves. Many hospitals treat (治疗) patients by having themtake up interesting hobbies. 3_____ In early times, most people were too busy making a living to have many hobbies. But some persons who had spare time did enjoy hobbies. 4_____ People today have more time than ever before for hobbies. Machineshave now reduced much time that people must spend on their jobs. 5_____ Those who have developed hobbies never need to worry about what to do with their newly-found free time hours. Sir William Osler, a famous Canadian doctor expressed the value (价值) of hobbies by saying, "No man isreally happy or safe without a hobby." A. More people retire at an earlier age than before. B. Hobbies can also help a patient to keep healthy. C. The ancient Egyptians played games with balls made of wood. D. They also go to concerts, climb mountains, go fishing, skate and swim. E. Anyone, old or young, sick or well, rich or poor, can follow a good hobby, in spite of his age, health or money. 查看答案