People often said Thomas Edison was the greatest genius of his age. There are only a few men in all of history, who have changed the lives of other men as much as the inventor of the first useful electric light. But Edison could never be pleased only because someone said he was a genius. "There is no such thing as genius," Edison said. He thought what people called genius was mostly hard work.
But Edison was a dreamer as well as a worker. From his earliest days as a child he wondered about the secrets of nature. He tried to understand them, and then he tried to learn what he could usefully do with them.
Edison enjoyed thinking. He knew that most people would do almost anything instead of the difficult work of thinking, especially if they do not think very often. But he knew, too, that thinking could give men enjoyment and pleasure.
Edison could not understand how anyone could not be interested in life. As he loved to think, he also loved to work. On the day he became 75 years old, someone asked him what idea he had about life. “Work,” he answered, “Discovering the secrets of nature and using them to make men happier.” He said he had enough inventions in his mind to give him another 100 years of work.
小题1:According to Thomas Edison, what's genius?
A．Hard thinking.
B．Useful inventions
C．Useful dreams.
D．Hard work.小题2:After exploring the secrets of nature, Edison always tried to______．
A．make them useful in life
B．carry out a new experiment
C．write down what he had learnt
D．share them with others小题3:Edison could not understand______.
A．how anybody enjoyed life
B．how anybody loved working
C．why anybody loved thinking
D．why anybody was tired of life小题4:The underlined sentence in the last paragraph means that______．
A．Edison was able to live another 100 years
B．life was too short for Edison to work for human beings
C．Edison was born to be a great inventor
D．Edison was ready to make his l00th invention
，力F随位移s变化的规律如图乙所示（取沿斜面向上方向为正），那么小物块运动12 m时速度恰好又为零，试求： 
