题目

方程(t为参数)的图形是（ ）A.双曲线左支B.双曲线右支C.双曲线上支D.双曲线下支 答案：解析：(t为参数). ∵x2-y2=e2t+2+e-2t-(e2t-2+e-2t)=4,且x=et+e-t≥2=2,∴表示双曲线的右支.答案：BPeter came from a poor family.His father died when he was six.His mother had no money to send him to school.His mother’s best friend,Mrs.Smith,felt that the boy was ____,and decided to give him some money so he ___go to school.When the boy finished high school,he found a job in the city.__ soon Mrs.Smith had a serious illness.As she was dying,she asked Peter to take care of her daughter.A few years later,Peter married the girl.He loved her so much that he tried to make her ___every day.He cooked lots of delicious food and bought all kinds of beautiful clothes for her.So she became very fat and found it ___to walk.One day,she felt uncomfortable.She went to the hospital.The doctor ___and told her not to eat meat,sugar,chocolate and things like that.She was afraid she might ___the doctor’s words,so she wrote all the names of the foods on a piece of paper.When she got home,she put the ___on the table and went out.When she returned home,she found all kinds of meat,sugar,chocolate in the kitchen.Peter was busy ___.As soon as he saw her,he said ____,“I’ve bought all the foods you wanted,dear!”【1】A. lazy B. clever C. funny D. boring【2】A. would B. must C. had to D. could【3】A. Though B. So C. But D. Or【4】A. outgoing B. lovely C. active D. happy【5】A. hard B. easy C. happy D. comfortable【6】A. looked her up B. looked her over C. looked for her D. looked at her【7】A. forget B. catch C. remember D. follow【8】A. notice B. name C. words D. list【9】A. eating B. drinking C. cooking D. having【10】A. sadly B. excitedly C. angrily D. politely