题目

已知双曲线，过双曲线的右焦点，且倾斜角为的直线与双曲线交于两点，是坐标原点，若，则双曲线的离心率为 A．       B．            C．        D． 答案：A(2015广东深圳北环中学三模)      Malaysia Airlines Flight MH370 disappeared from radar screens an hour after it took off on March 8.It has been 16       for more than 3 months.     The plane may fall into the sea.China,Malaysiaand many other countries have joined to search the 17        on the sea. The relatives of the 227 passengers and 12 crew are 18        good news from them.      How did the accident 19        ? It is said that the plane was attacked by the terrorists. Some think there may be something wrong with the plane,and others think the accident may be 20        by the mistake of the crew.However,it is 21        to tell the reason because the plane hasn’t been found yet.     It may 22        some time to find the missing plane and even more time to get to know the truth of what happened. However,we can’t stop imagining what has happened to the plane 23        it is found.     Whether the missing plane is found 24        not,the whole world should pay more attention to the safety of people,especially at airports.     We hope these people on the plane will be 25       ,and they can get together with their family members.  16. A. found   B. seen   C. missing  17. A. plane   B. terrorists   C. ship  18. A. talking about   B. waiting for   C. listening to  19. A. take   B. happen   C. come  20. A. given   B. met   C. caused  21. A. hard   B. easy   C. wise  22. A. spend   B. take   C. get  23. A. before   B. after   C. until  24. A. nor   B. so   C. or  25. A. dangerous   B. safe   C. friendly in.阅读理解(每小题2分，共38分)