During the summer vacation, Xiaoming browsed such an advertisement on the Internet: "Leap over Siberia, cross Eurasia, cross the vast desert and experience exotic customs."

(1)A is Southeast Asia, B is Western Europe, and C is West Asia;

(2) "The crossroads of Asia, Oceania, the Pacific Ocean and the Indian Ocean" refers to Area A, namely Southeast Asia, where residents like to eat rice because the climate is hot and humid, which is suitable for planting rice;

(3) If the cruise ship departs from Area A, the cargo on the cruise ship is likely to be natural rubber, oil palm, coconut and banana hemp, which is the area that produces the most natural rubber, oil palm, coconut and banana hemp in the world;

(4) The reason for the turbulent situation in West Asia is the important geographical location, rich oil resources and lack of water resources.

So the answer is:

(1)A is Southeast Asia, B is Western Europe, and C is West Asia;

(2) The climate in this area is hot and rainy, and rice is the main food crop in this area, so local people like to eat rice;

(3) Natural rubber, oil palm, coconut and banana;

(4) oil, territory, water resources and religious disputes.