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问题 解答题

一个三角形不可能既是等腰三角形，又是直角三角形．______．（判断对错）

答案

在直角三角形中，当除直角外的另外两个角相等时，它们的对边也相等，也就是直角三角形也可以是等腰三角形；

所以上面说法是错误的．

故答案为：×．

完形填空

It was Mother’s day .A man stopped his car at a flower shop to order some flowers which were supposed to be s_________小题1: by the salesman to his mother, ________小题2:lived two hundred miles away . When he got out ______ 小题3:his car ,he found a girl sitting on the roadside crying . He ____________(挥手) 小题4: to her and asked her what was wrong and she said she didn’t have e___________ 小题5:money to buy her mother a rose . The man decided to help buy the girl a rose .And _________ 小题6:offered to give the girl a _________(搭车) 小题7:home .But she asked to take her to her mother’s grave(坟墓). The man was _________ 小题8:moved that he returned to the shop , picked up the flowers he wanted , a_______小题9:drove two hundred miles to his mother’s house ,feeling _______（放松）小题10:.
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单项选择题

RIPv2对 RIPv1协议有三方面的改进。下面的选项中，RIPv2的特点不包括（52）。在 RIPv2中，可以采用水平分割法来消除路由循环，这种方法是指（53）。

53（）

A．不能向自己的邻居发送路由信息

B．不要把一条路由信息发送给该信息的来源

C．路由信息只能发达给左右两边的路由器

D．路由信息必须用组播而不是广播方式发送
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