单项选择题

It on be inferred from 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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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
Which of the following words could best replace the word one (Underlined)
A．Oil.
B．Door.
C．Store.
D．Product.
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