题目

        A machine that takes sweat-laden (浸满汗水的) clothes and turns the sweat into drinking water is in use in Sweden. The machine makes the clothes turn round quickly, heats them to remove the sweat, and then passes the steam through a kind of special material to make purified water. Since it has been brought into use, its creators say more than 1000 people have drunk others’ “sweat” in Gothenburg. They add the liquid is cleaner than local tap water. The device was built for the United Nations’ child-focused charity UNICEF to promote a campaign highlighting the下列营养物质中，在人体完成生命活动时，作为主要能源物质的是（　　）A．蛋白质B．脂肪C．维生素D．糖类中的葡萄糖