题目

下图是受精卵发生的一系列变化过程，表示细胞分化的是 A．①           B．②          C．③          D．④    答案：D1．Eight-year-old Jesse Abrogate was playing in the sea late one evening in July 2001 when a 7-foot bull shark attacked him and tore off his arm．Jesse's uncle jumped into the sea and dragged the boy to shore．The boy was not breathing．His aunt gave him mouth-to-mouth resuscitation （人工呼吸） while his uncle rang the emergency services．Pretty soon，a helicopter arrived and flew the boy to hospital．It was a much quicker journey than the journey by road．Jesse's uncle，Vance Folsenzier，ran back into to the sea and found the shark that had attacked his nephew．He picked the shark up and threw it onto the beach．A coastguard shot the fish four times and although this did not kill it，the shark's jaws relaxed so that they could open them，and reach down into its stomach，and pull out the boy's arm．At the Baptist Hospital in Pensacola，Dr Ian Rogers spent eleven hours reattaching Jesse's arm．"It was a complicated operation，"he said，"but we were lucky．If the arm hadn't been recovered in time，we wouldn't have been able to do the operation at all．What I mean is that if they hadn't found the shark，well then we wouldn't have had a chance．'According to local park ranger Jack Tomosvic，shark attacks are not that common．"Jesse was just unlucky，"he says，"evening is the shark's feeding time．And Jesse was in area without lifeguards．This would never have happened if he had been in area where swimming is allowed．'When reporters asked Jesse's uncle how he had had the courage to fight a shark，he replied，"I was mad and you do some strange things when you're mad．"56．What was the boy doing when the accident happened？DA．Feeding a hungry shark．B．Jumping into the rough sea．C．Dragging a boy to the shore．D．Swimming in a dangerous area．57．In which way did the boy's uncle help with the operation？AA．By finding his lost arm．B．By shooting the fish．C．By flying him to hospital．D．By blowing into his mouth．58．How was his uncle in time of danger？BA．Careful．B．Brave．C．Optimistic．D．Patient．