寄生物(parasite)
A、The parasite can't survive when they leave the host.
B、The parasite can survive when they leave the host.
C、parasite live freely in the enviornment.
D、parasites live in the host permanent.
A、A parasite must be parasitized in the special part of the host in its whole life cycle
B、A parasite that must parasitize in host or otherwise survive throughout its life cycle
C、At least one life cycle period must lead a parasitic life
D、A parasite always needs special hosts throughout life cycle
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