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
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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
单项选择题
We must ______ our strength and swim vigorously up stream.
A．sum up
B．summon up
C．catch on
D．watch out
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