试题题干
The swimming styles known as（）were invented by Australians.
参考答案
正确答案：
试题解析
The swimming styles known as the crawl and the butterfly stroke were invented by Australians. 自由泳和蝶泳是澳大利亚人发明的。
The swimming styles known as（）were invented by Australians.
The swimming styles known as the crawl and the butterfly stroke were invented by Australians. 自由泳和蝶泳是澳大利亚人发明的。