以下选项中，属于传统加密方法的是（）。 A．替代密码 B．换位密码 C．双钥技术 D
题型：多项选择题
问题：
以下选项中，属于传统加密方法的是（）。
A．替代密码
B．换位密码
C．双钥技术
D．公共密钥加密PKE技术
题型：多项选择题
阅读理解
Li Ping and I are in the same school. He is a Young Pioneer. We're good friends.
This is Li Ping's room. It's big. A black desk is in the room. On the desk are some English books
and Li Ping's schoolbag. The schoolbag is yellow. It's old. What's that under the red chair? It 
is a white
cat. It's a Chinese cat. Its name is Mimi.
Li Ping's father is near the desk. He's about fifty. He's a policeman. Where is his mother? She is near
the desk, too. She is a teacher of No. 16 Middle s
chool.
1. Li Ping and I are _______.
A. Young Pioneer
B. in the same school
C. girls
D. boys
2. Li Ping is ________.
A. a teacher
B. a policeman
C. a student
D. a friend
3. Li Ping
's schoolbag is ________.
A. old
B. new
C. in the desk
D. under the desk
4. The desk in the room is ________.
A. black
B. white
C. blue
D. yellow
5. 
_______ is a teacher.
A. Black
B. His mother
C. His father
D. He
