题目

    “Everything happens for the best，”my mother said whenever I faced disappointment (失望)．“If you carry on，one day something good will happen．”     Mother was right，as I discovered after graduating (毕业) from college in 1932，I had decided to try for a job in radio，then work my way up to a sports announcer．I hitchhiked (搭便车) to Chicago and knocked on the door of every station and got turned down every time．In one studio，a kind lady told me that big stations couldn’t risk hiring an inexperienced person．“Go out in the sticks and find a 10．在我们身边有许多应用杠杆的实例，以下一定属于省力杠杆的是（　　）A．赛艇的桨B．剪纸剪刀C．起瓶器D．独轮车