Mrs. Black lives on Second Avenue. New Year is coming. She wants to send (寄) a card to her friend in Toronto, but she doesn’t know where the post office is. She asks her neighbor (邻居) Mary, “ Is there a post office near here? I want to send a card.”
   “The post office is not near from here,” answers Mary, “but you don’t need to go to the post office to post the card. There is a mailboxin front of the supermarket. You can put your card into the mailbox”

填一填。

  5厘米=____毫米    90厘米=____分米              

  10分米=____米    8分米=____厘米

①那时，所谓的核武器研究设计院，还只是一片庄稼地。而科技人员呢，也寥寥无几。

②报到后做的第一件事，是换上工作服当小工，同建筑工人一起砍高粱、挖土、推车、和泥、盖房子。

③他作为原子弹理论设计的负责人，不得不从头做起。

④邓稼先走进了筹建中的核武器研究设计院。