下列索引中，不具有“唯一性”的是______。A．主索引 B．候选索引 C．唯一索引

用所给单词的适当形式填空。

1. _____ (eat) healthily is important for everyone.

2. She always does her best    ___   (study) every subject at school.

3. He wants to have a      ___ (health) life.

4. The boy used to behave ___ _   (bad) in class.

5. When he saw a book on the ground, he stopped _  ___ (pick) it up.

In our class ______ of the girls is interested in English.        [ ]

A. every          

B. everyone          

C. all            

D. each

人类最早的装饰行为与（）、（）、（）、（）等都有一定的联系。

（）元及以上面额必须全额机械清分。

A.5

B.10

C.20

南极在8月的平均气温是多少摄氏度？