有关学者就“成功者少年时具有怎样的素质”进行调查。结果是，有66.89%的成功者在少年时代喜欢自己独立做事情，有29.73%的人有时喜欢，不喜欢的只占3.38%．这表明（    ）

如图所示，动滑轮重为1N，拉力F为5N，则重物G和弹簧测力计的示数为（  ）

阅读短文，根据短文内容回答下列问题或翻译句子。
   It was very cold .It snowed heavily and blew very strongly . It was not a good night to go out . But David had to walk home from work ."I can be warmer ," he thought ,"I wear my coat backwards (反方向地)."He took off his coat and put it on backwards "That’s much better." He thought and walked on . About ten minutes later a car hit him. The driver stopped his car and got out of it .He ran to help David .
Soon a police car arrived .The policeman ran to look at David ."I’m afraid he’s dead. " The policeman told the driver .
   The driver could not believe it ." He can’t be dead ."He cried, "I did not touch him. Look at my car. There is not a mark on it.""He’s dead ." The policeman said again ."I don’t understand it ." The driver said ,"As soon as I hit him. I ran to help him. He was lying on the road , but he was breathing and there was no blood."
   "Did you touch him ? " The policeman asked .
   "Yes," The driver said ,"but I only turn his head around the right way ."
____ Why was David walking in such bad weather ?
____ How did David make himself warmer ?
____ Did the driver run to help David ?
____ Who killed David ?
____ 把画线的句子译成汉语。