要想在当前目录下方便地执行C盘\UCDOS目录中的程序，就应该先执行预设搜索路径的命令，该DOS命令为（）。
参考答案：PATHC：\UCDOS
句型转换。
1. My brother has lunch at school. (变一般疑问句)
_____ _____ brother _____ lunch at school?
2. Her grandparents like fruit. (对画线部分提问)
_____ _____ her grandparents _____?
3. I want some orange. (改为否定句)
I _____ _____ _____orange.
4. His sister doesn't like strawberries. (改为肯定句)
His _____ _____ _____.
5. She likes salad. (改为复数形式)
_____ _____ _____.
导游服务的基本属性是( )。
A．政治性 B．服务性 C．经济性 D．文化性
