单项选择题

在一个不带头结点的非空链式队列中,假设f和r分别为队头和队尾指针,则插入s所指的结点运算是( )。
A、r->next=s; r=s;
B、f->next=s; f=s;
C、s->next=s; r=s;
D、s->next=f; f=s;

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Which of the following are the main functions of transitions in a presentation?
A、Indicating the information structure of your presentation.
B、Helping the audience follow your presentation easily.
C、Indicating the relationship between points of your presentation.
D、Summarizing main idea of the presentation.