In the 1920s and 1930s when the automobile began to gain more popularity, ______ was one of the fastest growing segments of the international tourism industry.
In the 1920s and 1930s when the automobile began to gain more popularity, ______ was one of the fastest growing segments of the international tourism industry. A、train tourism B、cruise tourism C、coach tourism D、air tourism 【正确答案】：C
