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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