The passage mainly discuss ______.
A) the origins of drama C) the importance of storytelling
B) the role of ritual in modern drama D) the origins of ritual

A．The plot of drama is often unpredictable.
B．The nature forces in which dramas were performed.
C．The connection between rituals and dramatic plots.
D．The importance of plot in early drama.

A．Railroads provided relatively easy access to the west for the first time.
B．Railroads performed a useful service in extending the frontier and helping to achieve national unity.
C．There were abuses about building and operating the railroads.
D．The economy of the west is robust.