    Sentence I Whore ara’ @-bulk of Factories  concentrated along the Rhine?    ‘Sentonce..2: The Ruhr, ‘Which joins the Rhitie  “in” Duisburg, ‘is nowadays -a <lean river;  “thanks "tod ‘combination: of stricter  environmental . controls,“ a transition. from  heuy industry. to light industry and cleanup  measures, stich ‘as the :reforéstation’ of ‘Slag  and brownfields. .