用单词的适当形式填空。

1. These children talked with the foreigners very____    ( polite)．

2. The little girl paints the horse       __ (skillful) than before.

3. Today's weather is____       (bad) in Autumn of this year.

4. In my family my father plays ping-pong     _      (well).

5.You have made good progress these days, but I hope that you can make progress_____  (far).

计算机屏幕的RGB（红、绿、蓝色）系统与打印机CMYK（青、黄、洋红、和黑色）墨水系统比较，（）。

A.RGB颜色比CMYK更鲜艳

B.CMYK颜色比RGB颜色更鲜艳

C.RGB颜色空间比CMYK小

D.CMYK的色彩饱和度比RGB大