单项选择题

A．On the phone.
B．At United World College.
C．At a library.
D．At a hotel.
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单项选择题
A．Delivery service manager and driver.B．Teacher and student.C．Lawyer and client.D．Doctor and patient.
A．Delivery service manager and driver.
B．Teacher and student.
C．Lawyer and client.
D．Doctor and patient.
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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