OSI安全机制不包括（）
A.访问控制
B.抗抵赖
C.业务流填充
D.公证
参考答案：B
根据句意及首字母提示补全单词。
1.Canada is a l______ country.
2. There are many bowls of p______.
3. — Would you like some f______?
— Yes, an apple, please.
4. He's h ___ give him a large bowl of noodles.
5. This is the r ___ why he is late.
–Excuse me. _______
–Just go straight and turn left. It’s on your right.
A．Can I help you?
B．Where is the nearest station?
C．What’s the matter?
D．What would you like to eat?
