A．The natives opposed immigration more strongly.
B．The speed and scale of immigration were under control.
C．The natives world not lose their jobs.
D．The immigrants from other places began to arrive.
A．They were allowed to immigrate to America freely.
B．They were granted equal opportunities.
C．They could live a free life in the country.
D．They could get higher wages in America.
A．To help people survive.
B．To give people confidence.
C．To help people learn about the outside world.
D．To make up most of the information about the outside world.