Questions 8 to 10 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news. There are ______ Russian (s) and ______ American (s) on board.

A．current conditions that exist with a culture
B．individual behavior as shaped by a custom
C．behavior patterns common among members of a culture
D．differences existing within a culture