Question: What are some rivers over which there is a box girder bridge?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/design> <http://dbpedia.org/resource/Box_girder_bridge> . ?x <http://dbpedia.org/property/crosses> ?uri  . }
Answer: The crosses of the bridges designed by Box girder bridge are [answer].