只有得到允许的人才能修改数据，并能够识别出数据是否已经被篡改。这属于信息安全五个要素中的 (11) 。根据美国国防部和国家标准局的《可信计算机系统评测标准》，标记安全保护的安全级别为 (12) 。

A．A1

B．B1

C．B2

D．B3

阅读理解

                               Welcome to the 2012 London Olympic Games!

1. Who invented the sport of badminton?        

A. Indians.        

B. British        

C. Chinese.        

D. Koreans.

2. Which of these sports appeared earliest at the Olympics?

A. Archery.        

B. Badminton.    

C. Taekwondo.    

D. Football.

3. Which of the following pictures shows the sport of "Taekwondo"?