根据句意用括号内所给单词的适当形式填空。

1. The ice is as    ____as glass.(clear).

2. The sun______kisses the earth.( soft).

3. I sat in the garden and the______of the sun made me feel sleepy.(warm)

4. The classroom is usually very______after class.(noise)

5. Lucy has______hair.(gold)

6. The water running______under ice.(swift)

德国教育家赫尔巴特提出过的著名德育原则是( )

A．社会化活动原则

B．教育性教学原则

C．自然后果原则

D．知行统一原则