C

    Some children wish to be writers some day. They want to write stories or books for people to read. That's good! It's good to write something for people to read! But they should know that they need to be good readers first before they are really good writers. They should read a lot of books, instead(代替) of watching TV and spending a lot of time playing games when they are free.

    There is more fun in reading, and you want to look for more books to read.

    Before you decide(决定) to be a good writer, you'd better say to yourself, "I must read more and more!"

⊙O的半径为7cm，点P到圆心O的距离OP=10cm，则点P与圆O的位置关系为（　　）

把6.8写成以千分之一为单位的小数是____ 。