The author believes that in the later part of the 19th century, Chinese immigrants received

A．it tells people there will be an earthquake in the near future.
B．it changes the official earthquake prediction for the area.
C．it makes it possible for scientists to calculate the magnitude.
D．it proves scientists' long-time suspicion about hidden faults.

A．economics.
B．national security.
C．the emergence of the Internet.
D．the changing functions of the European Community.