在夹具中，，用一个平面对工件的平面进行定位，可以限制工件的（）自由度。

A、二个

B、三个

C、四个

按要求改写下列各句，每空一词。

1. The woman with the baby is walking into the shop. (就画线部分提问)

     ______ ______ is walking into the shop?

2. He often has bread for breakfast. (改为一般疑问句)

    ______ he often ______ bread for breakfast?

3. Mr Wilson goes to work by bus every day. (改为同义句)

    Mr Wilson ______ ______ ______ ______ work every day.

4. I go to see my uncle by boat. (就画线部分提问) 

    ______ ______ you go to see your uncle?

5. She likes going to school on foot. (改为同义句)

    She likes ______ ______ school.