单项选择题

Richard was his father's only ______, as he had no brothers or sisters.

A．offspring
B．heritage
C．heir
D．heiress
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单项选择题
The World Health Organization fights against ______ diseases all over the world.
A．ingenious
B．infectious
C．influential
D．indignant
单项选择题
Too much information can only ______ people and they don't know what to do with it.
A．brighten
B．glare
C．dazzle
D．glitter
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