What is the passage mainly about

A．The shock a business man feel when there is no room for bargaining.
B．The shock Peace Corp volunteers suffered from in Borneo.
C．The shock a traveler feels in a strange environment.
D．The shock Marco Polo felt in Chin

A．Information in short-term memory is different from that in long-term memory only in content.
B．Long-term memory can be achieved only by training.
C．It is easier to test short-term memory than long-term memory.
D．Henning gave a test on vocabulary to his subjects.