Spring Festival travel rush's peak is immigration.

Question 2:C

Question 3:C

Question 1: This question examines population migration. Question 1, the adverse impact of population migration on the place of emigration.

Question 2: Question 2: The pressure in Spring Festival travel rush is mainly due to the large flow of migrant workers.

Question 3: Question 3, Germany mainly attracts people to move in because of its developed economy; Saudi Arabia attracts a large number of foreign workers mainly because of the development of oil, which is also an economic factor.