The "metal and glass cocoon" (Line l, Para.5) refers to ______.

A．They think them fashionable.
B．They want to keep themselves fit.
C．They look for pleasure and excitement in activities.
D．They have a lot of free time to enjoy themselves.

A．The margins will be lower and the profit will be cut.
B．Sales will drop rapidly,
C．The profitability will be higher.
D．The product will be better in quality.