单项选择题

Electronic privacy is ______ to the ongoing success of the Internet as a service and as a commercial and entertainment medium.

A．subordinate
B．cumulative
C．crucial
D．permeated
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单项选择题
Perhaps the most important ______ of good web de sign is a clearly organized structure or Information Architecture (I
A．.A) element
B．component
C．ingredient
D．constituents
单项选择题
The asexual ______ cycle of the parasite takes place within red blood cells, well shielded from attack by the immune system.
A．manipulation
B．reproduction
C．circulation
D．penetration
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