Compared with 1980s, what is the biggest development of portable computers in 1990s？A．They

Compared with 1980s, what is the biggest development of portable computers in 1990s？

A．They are easier to carry and closer to their users.

B．Their appearances are more elegant.

C．They are found on desktops instead of back rooms.

D．Computer producers provide more brands for selection.

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