单项选择题

During the 19th century, heat was recognized as ______ of motion among tiny molecules.

A．manifestation
B．acceleration
C．abundance
D．deterioration
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单项选择题
Readers will find that a library's collection of books usually ______ two categories: fiction and non-fiction.
A．falls into
B．runs into
C．separates into
D．turns into
单项选择题
The high ______ of road accidents on the super high way is giving cause for serious concern.
A．coincidence
B．occurrence
C．circumstance
D．occasion
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