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问题 填空题

种子站做发芽实验，种子的发芽率是97.5%，要得到390棵芽，需要种子______粒．

答案

390÷97.5%=400（粒）；

答：需要种子400粒；

故答案为：400．

填空题

读下面一段短文，用括号内所给单词的适当形式填空。

       A young woman was waiting at the airport. She bought a packet of cookies. She sat down and

started   1   (read) the book. Later, a man sat down next to her. When the woman took the   2   (one)

cookie, the man took one, too. She was really surprised but said   3   (something)."Why is he eating my

cookies?"She thought.

       Every time she took a cookie, the man took one, too. Then there was only one cookie left in the

packet. The man picked the last one up, divided (分) it in half,   4   (give) her a half and left the waiting

room. She got very angry.

       When she got on the plane, she found that there   5   (be) a packet of cookies in her handbag. It

was never opened.
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单项选择题

PPP协议是数据链路层的一个协议，它被广泛用于接入Internet中。PPP协议是一个 (1) 。帧长为整数个字节。它克服了SLIP协议的缺点，可以进行协商，并且 (2) 。它可以分成3个层次，其中的网络层协议被称为 (3) ，包括了不同的网络层协议。利用PPP的优势，结合以太网产生了 (4) 协议，该协议可以通过简单的共享设备将多个客户网段接入到骨干网。若通过SLIP方式接入Internet，用户端p是 (5) 。

2（）

A．增加差错控制

B．增加安全认证

C．增加连接控制

D．增加交互控制
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