According to the passage, cell phones were launched______.
A．in the late 1970s
B．between 1955 and 1960
C．in the late 1955s
D．in the early 1990s

A.
A．in
B.between
C.in
D.in

【参考答案】

B
事实细节题。根据选项数字定位到第二段最后一句“从20世纪80年代初手机进入市场以来···”。其中“launc......

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