单项选择题

What might be the best title for the passage

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

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单项选择题

Special words used in technical discussion ______.

A．never last long
B．should be confined to scientific fields
C．may become part of common speech
D．are considered artificial language speech

单项选择题

The author' s main purpose in the passage is to ______.

A．describe a phenomenon
B．propose a solution
C．be entertaining
D．argue a belief