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单项选择题
INOCULATION : IMMUNITY ::
A． talisman : charm
B． serum : antidote
C． exposure : weathering
D． indoctrination : disloyalty
E． invasion : fortification
单项选择题
The epiphyte plants of the rain forest use trees for physical support but do not, like______ , sap nutrients from their hosts.
A． fauna
B． predators
C． parasites
D． insectivores
E． stumps
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