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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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
单项选择题
Officials, whatever their rank, are supposed to ______ themselves to the welfare and health of the general public.
A．accustom
B．commit
C．accommodate
D．adapt
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