根据句意和首字母填空。

1. It's q    __ a nice cat.

2. The bus is coming. Be c         ful.

3. What's the time? It's a q         past one.

4. —How many m         do you have a day?

    —Three-breakfast, lunch and supper.

5. Tigers are a kind of  a         .

6. There is a smile on her f         .

简述测定季节变动的按月（或季）平均法的基本步骤和原理。