单项选择题

A．Delivery service manager and driver.
B．Teacher and student.
C．Lawyer and client.
D．Doctor and patient.
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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
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
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