题目

已知椭圆方程，椭圆上点M到该椭圆一个焦点F1的距离为2，N是MF1的中点，O是椭圆的中心，那么线段ON的长度为（  ）A.2                           B.4                              C.8                           D. 答案：解：设另一个焦点为F2，|MF2|=10-|MF1|=8，∴|ON|=|MF2|=4.答案：BIt was my first day at Grade 6. And the first lesson was _____ English. When I was doing nothing，Mr. Gough, our new English teacher, _____ into the classroom.To my surprise, he held up a book, The Collected Works of Edgar Allan Poe, and asked if anyone _____ it. I put my hand up, because Poe was my favorite writer. Mr Gough asked if I really understood _____ the author tried to say in his book. My reply made him smile, and he asked me _____ an essay on that subject.After that, English classes became a new interest for me. Mr Gough thought that students had to _____ a play to understand it. ＂Don’t just read it, ＂he said.As time pased, we developed a real friendship. He encouraged me to be a _____ in the future. When I left school, he said to me,＂You have a gift for writing, Tony, and one day you’ll come to realize how _____ it is. Make use of it if you want your life to be complete.___ has passed. Now every time I sit down to write ______, I think of Mr Gough. He was more than just an English teacher, because he also taught me useful lessons in life.1.A. boring B. bored C. interesting D. interested2.A. walks B. walked C. was walking D. is walking3.A. reads B. read C. has read D. had read4.A. if B. when C. what D. how5.A. wrote B. writing C. to write D. written6.A. work out B. act out C. put out D. come out7.A. teacher B. actor C. waiter D. writer8.A. useful B. beautiful C. careful D. thankful9.A. Many year B. Some year C. Several years D. Every year10.A. anything new B. something new C. new anything D. new something