下列几何体中主视图、左视图、俯视图都相同的是（　　）

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。

观看影视作品是我们了解历史的一个重要途径，可以让我们更直观地走进历史。要了解二战具有重要转折意义的事件，下列有关二战题材的电影，最适合的是（    ）

① 要使像能够成在光屏的中央，应将光屏向____（选填“上”或“下”）；

② 实验过程中，当烛焰距凸透镜15cm时，移动光屏至某一位置，在光屏上得到一等大清晰的像；接着使烛焰向左移动5cm，此时应该将光屏向____移到某一位置（选“左”或“右”），才能在屏上得到倒立、清晰的实像；

③ 当烛焰距凸透镜10cm时，光屏上得到了一个清晰的实像，应用这一规律可以制成____（选填“照相机”或“投影仪”）。