单项选择题

How many old people have been examined for the research

A．815.
B．855.
C．831.
D．865.

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单项选择题

German technology conglomerate Siemens showed its new mobile phones

A．at a news conference.
B．at a mobile trade show.
C．at a mobile handset unit.
D．at a mass market.

单项选择题

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 bran

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