春秋季节在我省常出现大雾天气，对于这种现象下列说法正确的是 [ ] A．大雾是由

中学生林某本来是一个品学兼优的学生，偶尔一次走进了网吧，被网络游戏深深吸引，从此学习成绩急剧下滑，后因经常无故旷课、逃课被学校勒令退学，林某的经历告诉我们 [ ]

①网络游戏对青少年有害无益

②我们休闲时，可以通过网络游戏来适当的放松自己，但决不能沉迷

③我们要以丰富的学习、健身、交友等活动坚决抵制这一诱惑

④网络游戏对青少年有相当大的诱惑，社会上应关闭一切网吧

A．①②

B．②③

C．③④

D．①④

不踬于山，而踬于垤”中，垤是指（）。

某公司预计本年度的有关资料如下。
资料一：公司总负债400万元，均为长期负债，平均利息率10%；发行普通股股数120万股，每股市价20元；长期资产1000万元，其中固定资产700万元，无形资产100万元，长期投资200万元；流动资产600万元，其中现金100万元，应收账款300万元，存货200万元。
资料二：公司息税前利润为1600万元，预计普通股报酬率为15%，假设公司所得税税率为40%。

计算该公司的加权平均资金成本。

下列哪项是慢性盘状红斑狼疮的特征（）

A.面部蝶形红斑.毛囊性角栓，基底层液化变性，真皮附属器周围淋巴细胞浸润

B.贫血、白细胞减

C.血小板减少

D.补体减少

E.红斑狼疮细胞检查阳性

Border Gateway Protocol(BGP) is inter-autonomous system (96) protocol. BGP is based on a routing method called path vector routing. Distance vector routing is not a good candidate for inter-autonomous system routing because there are occasions on which the route with the smallest (97) count is not the preferred route. For example, we may not want a packet through an not secure even though it is the shortest route. Also, distance vector routing is unstable due to the fact that the routers announce only the number of hop counts to the destination without actually defining the path that leads to that (98) . A router that receives a distance vector advertisement packet may be fooled if the shortest path is actually calculated through the receiving router itself. Link (99) routing is also not a good candidate for inter-autonomous system routing because an Internet is usually too big for this routing method. To use link state routing for the whole internet would require each router to have a huge link state database. It would also take a long time for each router to calculate its rousting (100) using the Dijkstra algorism.

（96）是（）

A.routing

B.switching

C.transmitting

D.receiving