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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单项选择题
According to the passage, how did knowledge about chemical processes increase before the seventeenth century
A．Philosophers devised theories about chemical properties.
B．A special symbolic language was developed.
C．Experience led workers to revise their techniques.
D．Experts shared their discoveries with the public.
单项选择题
The bold word hampered in Line 1 Para 2 is closest in meaning to ______.
A．recognized
B．determined
C．solved
D．hindered
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