Whether you believe it or not, it is           that causes your illness.

A．due to your overweight

B．because you are overweight

C．you are overweight

D．your being overweight

提高计算机可靠性可以采用冗余技术，下面的例子中属于信息冗余的是______。

A．软件备份
B．CRC校验
C．程序卷回
D．指令复执