题目

过椭圆的右焦点作一条斜率为2的直线与椭圆交于A、B两点，O为坐标原点，则△OAB的面积为______________ 答案：右焦点为F1(1,0),∴AB的方程为y=2(x-1)=2x-2,必过短轴的一个端点.4x2+5·4(x-1)2=20,解得x=0或x=.∴S△OAB=·|OA|·|BC|=·2·=.After medical school, Michael moved to Southern California. He became a ______ at Mission Community Hospital. There Michael was known for his hard work. Many patients were helped by Michael, including a little baby called Chris.In August 1985, Chris entered the world earlier than expected, weighing only 1.5 kg. A few months later, he was back in the hospital. His temperature rose quickly with all the symptoms of meningitis(脑膜炎症状). Michael didn't ______ this young patient's side. "Anything could have gone wrong at that point, so I stayed there through the night to make sure everything was done______," Michael said. What Michael did meant the world to Chris' parents, especially the next day when Michael_______ to them that their baby's fever had gone. Then Chris' parents chose Michael to be their son's doctor for his childhood. When Chris finished primary school, the two lost ______. What Michael could never expected was how Chris would reenter （重返）his life 30 years later.At around 5 a.m. on March 29, 2015, Michael was driving home when suddenly a truck ______ control and hit his car badly in front of him. "Then I felt heat and looked down and could see fire around my legs!" As he tried to open the door, he realized it was ______. He was trapped in his car watching fire rise up around his legs. After more than 40 years helping others as a doctor, suddenly he needed ______. But he could never have imagined where it would come from.Luckily, less than a mile away, a group of firefighters were coming. Guess who was in this group? It was Chris. They arrived there in time. They helped Michael out of the car and sent him to the hospital. As Chris learned the name of the person he had just saved, he said, "I surely ______ him. But I couldn't believe it." When Michael realized that the little baby he once saved had just saved him, all he could do was to hold back tears."It really makes you think about ______," Michael says, "Everything we do is so important and affects （影响）so many others."1.A. teacher B. driver C. doctor D. worker2.A. miss B. pass C. leave D. follow3.A. fast B. right C. warmly D. slowly4.A. reported B. listened C. showed D. complained5.A. hope B. touch C. trust D. message6.A. had B. kept C. lost D. took7.A. open B. shut C. safe D. cold8.A. help B. wish C. chance D. effort9.A. record B. interrupt C. encourage D. remember10.A. study B. dream C. time D. life