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)
    ___________________________________________________________

【考点】系动词,疑问代词,疑问副词,疑问词组

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