句型转换。 1. China's flag is red. (对划线部分提问)
题型：句型转换
问题：
句型转换。
1. China's flag is red. (对划线部分提问)
_________________ China's flag?
2. Australia is south and east of China. (对划线部分提问)
____________ is Australia?
3. They speak English in the U.S. (对划线部分提问)
___________________________________________________________