【阅读下面短文,用适当的关系代词填空（就是who,that那些的）ManyAmericansenjoycamping.EachsummermillionsofAmericansdrivetothecountrysidewheretheyfindplacestocamp.Thenationalparks1._____freshair,clearlakesand】

　　阅读下面短文,用适当的关系代词填空（就是who,that那些的）

　　ManyAmericansenjoycamping.EachsummermillionsofAmericansdrivetothecountrysidewheretheyfindplacestocamp.Thenationalparks1._____freshair,clearlakesandthickforestsareattractivetocampersarefavouritecampingplaces.Campershike,swimandfish.Somecampershavetrailers2._____theydriveorpullbehindtheircampsites.Trailersarelikehousesonwheels.Theyhavemanyconveniences3._____peoplehaveintheirhomes,suchaselectricityandhotwater.Butmostcampersdon'thavetrailers.Theycampintentsintheircampsites.Campers4._____areintentsdon'thavetheconveniences5._____campersintrailershave.Tentcampersenjoyaverysimplelife.