A、
In the 1940s.
B、
In the mid-1990s.
C、
In the 1970s.
D、
In the 1990s.
【正确答案】
A
【答案解析】
A、
Because they were developed very well.
B、
Because they were portable for every consumers.
C、
Because they sold very well in the world.
D、
Because they were affordable to individual consumers.
【正确答案】
D
【答案解析】
A、
The improvement of computers' performance.
B、
The formation of a network.
C、
The expansion of marketing channels.
D、
The improvement of its after-sales service.
【正确答案】
B
【答案解析】
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