单项选择题

According to the passage, many people initially thought that E. L. Drake had made a mistake by ______.

A．going on a whaling expedition
B．moving to Pennsylvania
C．searching for oil
D．retiring from his job
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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
单项选择题
The bold word it refers to which of the fallowing
A．Problem.
B．Material.
C．Difficulty.
D．System.
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