根据首字母及句子意思在句子中填人适当的单词，使句子意思连贯语法正确。

1. Uncle Liu is a d_________, he works in a hospital.

2. We may feel s_________ when unhappy things happen to us.

3. Going to school w_________ breakfast is bad for your health.

4. In the south of China, people eat rice a lot and in the n_________ of China they often eat noodles.

5. Jane is good at English, but she is w_________ in Chinese.

下列叙述中错误的是

A．二又树不是线性结构

B．线性表是非线性结构

C．线性链表是线性结构

D．栈与队列是线性结构