改写句子。

1. Are these tomatoes? (作肯定回答)

    __________________________________

2. They are carrots. (就划线部分提问)

    __________________________________

3. I like potatoes. (汉语翻译)

    __________________________________

4. I like oranges. (改为否定句)

    __________________________________

Oracle数据库实例的建立采用的命令是（）.