单项选择题

The conversation most probably takes place between

A．a host and a guest.
B．a doctor and a patient.
C．a hotel clerk and a guest.
D．two colleagues.
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How many old people have been examined for the research
A．815.
B．855.
C．831.
D．865.
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A new mobile phone launched by German technology conglomerate Siemens is
A．equipped with a camera.
B．linked with a computer.
C．introduced with a fashion.
D．shown as a new brand.
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