排顺序。

1. (      )It's in June.  How about you?

    (      )Mike, when is your birthday?

    (      )Oh, your birthday is coming.

    (      )It's in August.

2. (      )No, I don't. It's too cold.

    (      )Spring. It's warm. I can fly kites.

    (      )Nancy, do you like winter?

    (      )Which season do you like best?

    ( )You can plant trees, too.

试述分组互换法应用在何种场合？