单项选择题

What is the best title for the passage

A．Oil Refining: A Historical Perspective
B．The California Gold Rush: Get Rich Quickly
C．Private Property: Trespassers Will Be Prosecuted
D．Kerosene Lamps: A Light in the Tunnel

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单项选择题

The bold word it refers to which of the fallowing

A．Problem.
B．Material.
C．Difficulty.
D．System.

单项选择题

Why does the author mention the California gold rush

A．To explain the need for an increased supply of gold
B．To indicate the extent of United States mineral wealth
C．To describe the mood when oil was first discovered
D．To argue that gold was more valuable than oil