1. 先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。

    It is a Saturday aftemoon．Susie is watching the two1play．They are Joe and Bob．They are2their bikes．

    Susie's mom comes out of the house and asks，"3are you doing，dear?'

    Mom,I'm watching the boys ride their bikes，"says Susie."Can you4me to ride a bike?"

    Susie's mom5it and agrees(同意)at last．Susie is only four years old．She is 6at first．Her mom holds (抓住) the bike when she starts to ride．7about half an hour,she is not afraid．She is having fun．Suddenly(突然)，she8that her mom isn't holding the bike．She is afraid．9she soon finds that she can ride a bike all by herself (独自)．She is very10 ．