单项选择题

A．By observation.
B．By prediction.
C．By recording.
D．By examination
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单项选择题
A．The countryside.B．A nearby university.C．Abroad.D．A big company.
A．The countryside.
B．A nearby university.
C．Abroad.
D．A big company.
单项选择题
A．Information on after-sales service.B．Some pictures about the newest computers.C．A list of software products.D．A model of the newest computers.
A．Information on after-sales service.
B．Some pictures about the newest computers.
C．A list of software products.
D．A model of the newest computers.
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