问题
填空题
已知二次函数y=mx2+（m-1）x+m-1的图象有最低点，且最低点的纵坐标是零，则m=______．
答案
根据公式，其最低点坐标为
=0，4m(m-1)-(m-1)2 4m
解得m=1．
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已知二次函数y=mx2+（m-1）x+m-1的图象有最低点，且最低点的纵坐标是零，则m=______．
根据公式，其最低点坐标为
=0，4m(m-1)-(m-1)2 4m
解得m=1．
It was a sunny day. A city man was driving along a country road with a new wagon（马车）and a beautiful pair of horses. He didn’t pay a lot of 16 to where he was going. Pretty soon he 17_ that he was lost, but he continued to drive, expecting to re-find his way or to 18 someone who could tell him how to get back to the 19 . It was a long 20 road. For many __21__ he kept on driving. When it was almostdark ，he saw in a field a tall 22 ploughing（犁地） the land. He stopped his 23 team of horses near the fence and called out，“Hello，farmer.” “Hello，yourself，”the farmer___24____，still ploughing . “Where does the horse go？”he asked without knowing his language mistakes. “I haven’t seen it go anywhere. It 25 stays right where it is，”said the farmer，withoutstopping his work. “How far is it to the next town？” said the city man，speaking a little more 26 . “Don’t know. I never 27 it,” replied the farmer. By this time the city man was getting 28 .“What do you know？You’re the biggest fool I ever saw.” Finally stopping, the farmer turned and looked for a long time 29 at the city man. Then he said，“Maybe I don’t know much. 30 I am a fool. But at least I’m not lost！”
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