危重伤员的伤员标记卡为
A．黑色
B．黄色
C．红色
D．绿色
参考答案：C
—Mom, Bill is coming to dinner this evening.
—OK. Let's give him _______ to eat. [ ]
A. anything different
B. different anything
C. something different
C. different something
现代密码学的一个基本原则是一切秘密寓于（）中
A.密钥
B.密码算法
C.明文
D.秘文
