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1.已知椭圆C:x^2/a^2 +y^2/4=1的一个焦点为(2,0),则C的离心率为(　　)A.1/3 B.1/2 C.√2/2 D.(2√2)/32.过椭圆x^2/4+y^2/3=1的焦点的最长弦和最短弦的长分别为 (　　)A.8,6 B.4,3 C.2,√3 D.4,2√33.已知椭圆x^2/a^2 +y^2/b^2 =1与椭圆x^2/25+y^2/16=1有相同的长轴,椭圆x^2/a^2 +y^2/b^2 =1的短轴长与椭圆y^2/21+x^2/9=1的短轴长相等,则(　　)A.a2=25,b2=16B.a2=9,b2=25

某卡车为乡村小学运送书籍,共装有10个纸箱,其中5箱英语书、2箱数学书、3箱语文书.到目的地时发现丢失一箱,但不知丢失哪一箱.现从剩下9箱中任意打开两箱,结果都是英语书,则丢失的一箱也是英语书的概率为(　　) A.29 B

1.方程y-y0=k(x-x0)(　　)A.可以表示任何直线B.不能表示过原点的直线C.不能表示与y轴垂直的直线D.不能表示与x轴垂直的直线

1.双曲线方程为x2-2y2=1,则它的右焦点坐标为(　　)　　　　　　　　　　　　　　　　　A. √2/2,0 B. √6/2,0 C. √5/2,0 D.(√3,0)2.已知双曲线x^2/a^2 -y^2/b^2 =1(a>0,b>0)的左、右焦点分别为F1,F2,点P在双曲线的右支上,若|PF1|-|PF2|=b,且双曲线的焦距为2√5,则该双曲线的方程为(　　)A.x^2/4-y2=1 B.x^2/3-y^2/2=1C.x2-y^2/4=1 D.x^2/2-y^2/3=1

1.甲、乙两人各进行1次射击,如果两人击中目标的概率都是0.7,则其中恰有1人击中目标的概率是(　　)A.0.49 B.0.42 C.0.7 D.0.91

则kPB1·kPB2=y0+bx0·y0-bx0=y02-b2x02=-b2a2,因此A不正确; ∵点P在圆x2+y2=b2外,∴x02+y02-b2>0, ∴PB1·PB2=(-x0,-b-y0)·(-x0,b-y0)=x02+y02-b2>0

2.(2020安徽淮南九中月考)要从甲、乙、丙、丁、戊5个人中选出1名组长和1名副组长,但甲不能当副组长,则不同的选法种数是(　　)A.20 B.16 C.10 D.6

。组织是人才的组合，也是每个人要发挥其专业才能的所在。         C主管除设法让部属充分表现外，更应透过各种沟通与协调，使部属上下一心。主管要通过理念的灌输、会议、目标和各种制度设计，促使大家彼此相互配合，同心协力，抛弃本位主义。

Unit 6 Earth first ——Using language一、根据语境及汉语提示写出单词1.The medicine __________(减少)the risks of heart disease. 2.This __________(严重的)consequence was caused due to their carelessness. 3.Ear _________

agony n.痛楚,苦难【课文原句】Our Agony Aunt answers your questions.我们的知心阿姨回答你的问题。【词汇精讲】agony 是名词,意为“痛楚,苦难”。

pollution is particularly strong.”可推测，青少年在交通拥堵时应尽量不待在户外。故选B项。] 4.D　[文章出处题。根据文章的主要内容，尤其是第一段中的“And teens who

Unit 2 Let＇＇s celebrate ——Using language一、单句语法填空1．You are requested _____(make) a speech at next meeting.2．Whether they gain or lose in _____ process is a hotly debated question.3．Yunnan is one

Unit 4 Stage and screen——starting out一、单词拼写1．His face darkened with ______(愤怒) when he heard the bad news.2．Scientists disagree about how the ______(宇宙)was created.3．It makes me feel fresh and _

Unit 4 Stage and screen——starting out一、单词拼写1.The following card includes a 　　　　　(简短的) summary and a short assessment of a research paper. 2.Only with the greatest of luck did he manage to e　　　　 f

Unit 5 On the road——Developing ideas一、单词拼写1．Be clear and honest in your statement，but keep your ______(感情) under control.2．Great changes have taken place since you told me the ______(技巧) of singi

案的问题，从而激发好奇心，故选B项。] 2．A　[根据空后一句可推知，开车时关掉电子设备，多看看窗外也是一种与大自然接触的方式，故选A项。] 3．C　[根据上文中的“Time in nature is

Unit 3 On the move ——Presenting ideas一、单句语法填空1．I have a lot of readings ______(complete) before the end of this term.2．I＇m going to town.Do you have any letters _____(post)?3．They had no chance

Unit 4 Stage and screen——Understanding ideas一、单句语法填空1．We will act out a conversation about making an ____(arrange) to go to a comedy show.2．He has lost all his friends as a result of his foolish

Unit 6 Earth first ——Understanding ideas一、用所给单词的正确形式填空1.With winter __________(come),it’s time to buy warm clothes. 2.I’ve never heard the word __________(use)in spoken English. 3.The foreigner

 八上（外研版）Module 2 Unit 3 导学练习题 Class__________Name __________Number_________ 一、 语法聚焦（形容词比较级的用法） 1. A