seems to be one of the main reasons for many people        in today’s world.
A．Having an adventure; to travelB．To have an adventure; traveling
C．Have an adventure; to travelD．To give an adventure; traveling
A
        seems to be one of the main reasons for many people句中缺少主語(yǔ)，排除C;而不定式作主語(yǔ)表示具體的一次行為，本句是泛指冒險(xiǎn)這一行為，所以也排除B和D。選A。
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