For the limited-capacity tour programs, the use of _____ is a convenient way to reduce cost
A、shell folders
B、umbrella brochures
C、regular tour brochures
D、booklets
【正确答案】：A
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For the limited-capacity tour programs, the use of _____ is a convenient way to reduce cost
A、shell folders
B、umbrella brochures
C、regular tour brochures
D、booklets
【正确答案】：A
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