複選題
15.(AB) With little competition, some vendors let standards slip.
(AC) Progressively marginalized, some vendors sought new niches.
(AD) Others have started catering private events as a sideline or even their specialty.
(AE) Many brick-and-mortar businesses also resented the competition vendors provided.
(BC) Some observers thought food trucks were a flash in the pan, but the public saw things differently.
(BD) As food trucks became more popular across the country, food truck rallies—where multiple food trucks gather in one location—were born.