[完形填空]  点击听音频1.TheBelgiancityofGhenthasdeclaredMondaysmeat-freedays.2.Thelivestocksectorhasbecomeoneofthetoptwoorthreemostsignificantcontributorstothemostseriousenvironmentalproblems.3.Theauthorisacompletevegetarian.4.Accordingtothepassage,peoplewhoeatlessmeatwillbeeasilysick.5.Therearen'tmanyvegetariandishesintherestaurantmentionedinthepassage.