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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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
单项选择题
It can be inferred form the passage that kerosene was preferable to whale oil because whale oil was too ______.
A．expensive
B．thick
C．hot
D．polluted
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