11.B 由第一段中Food poisoning is usually not serious, but some types are deadly.可知。
12.C 由第一段倒数第二句可知。
13.B 由第五段Food should be kept in a refrigerator to stop microorganisms from growing.可知low temperatures不能导致food poisoning。
14.D 由第五段第一句话可以推测出D恰当;A太绝对,B、C无内容支持。
15.C 由文中第五段第一句话可推测出C正确。