单项选择题

Mary is an active______ in social work. She spends much time staying with orphan children every summer.

A．patriot
B．pilgrim
C．participant
D．parasite
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单项选择题
It is said that the number of the people who died on highways has exceeded the ______since the American Revolutionary War.
A．executions
B．casualties
C．personnel
D．hostages
单项选择题
There are some______ between their two descriptions; we are puzzled which we should believe.
A．discrepancies
B．distractions
C．diversions
D．discretion
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