下列选项中，（）是非公路交通标志？
A、服务区指示牌
B、国道上的高速公路收费站预告标牌
C、确认车距标牌
D、交通设施生产厂家介绍标牌
参考答案：D
He ______ to the party this evening if he has to look after his younger sister. [ ]
A. needn't to come
B. doesn't need to come
C. doesn't need come
D. needs not come
信息组织的中级形式是（）
A.信息采集
B.信息描述
C.信息分析
D.信息揭示
