题目

设，若是与的等比中项，则的最小值为__________． 答案：【答案】【解析】由已知, 是与的等比中项，则 则 ，当且仅当时等号成立故答案为2      LONDON Thursday July 26(Reuters)—Eddy missed his girlfriend Anna so much he flew back to Britain from Australia to propose(求婚)　to her. The problem is she did the same in the opposite direction.      He and Anna even managed to miss each other when they sat in the same airport waiting room in Singapore at he same time to wait for connecting flights.      Anna, heartbroken when she arrived at Eddy’s Sydney flat find he had flown to  London, told The Times,“It was as though someone was playing a cruel joke on us. ”     “He is the most romantic person I have ever known.I think our problem is that we are both quite impulsive(冲动的)people. We are always trying to surprise each other.”      After an 11,000-mile flight across globe, she was greeted by Eddy’s astonished roommate asking what she was doing there.      Eddy,a 27-year-old engineer had taken a year off to travel round Australia. But he was missing Anna,a 26-year secretary, so much he got a job on a Sydney building site (工地)and started saving for a surprise.       He then flew home to Britain and went to her flat armed with an engagement (订婚)ring, wine and flowers.     “I really missed Anna and I’d been thinking about her all the time .I was so excited when she phoned me from Australia ”he said.      Eddy then asked Anna to marry him on the phone .“I didn’t know whether to laugh or cry but I accepted,” she said.      Anna was given a tour of Sydney by Eddy’s friends before going back home. Eddy had to stay in Britain for two weeks because he could not change his ticket. 45.What does the last sentence of the first paragraph tell us? A.Anna flew to Britain from Australia to marry him. B.Anna flew to Australia from Britain to marry him. C.Anna flew to Britain from Australia to propose to him. D.Anna flew to Australia from Britain to propose to him. 46.The underlined word“miss”in paragraph 2 most probably means_______. A.escape from               B.fail to understand       C.fail to meet                    B.long to see 47.Eddy got a job on a Sydney building site because he________. A.wanted to travel round Australia              B.needed money to pay his daily cost C.was an engineer at this building site         D.hoped to make money from this job 48.Which of the following is TRUE about Eddy and Anna according to the text? A.Eddy proposed to Anna on the phone and Anna accepted. B.Anna stayed in Australia waiting for Eddy’s arrival. C.Anna bad a good time touring Sydney with Eddy. D.Eddy met Anna in the airport waiting room by chance.