3.What happened(发生) in the 1970s? A)The US government(政府) recommended(推荐) the amount(数量) of food a restaurant(餐馆) gave(给) to a customer(顾客). B)Health experts(健康专家) persuaded(劝说, 说服) restaurants to serve(供应) smaller portions. C)The United States (美国)produced(生产,结(果实), 引起) more grain(粮食) than (it is) needed(被需要的). D)The American waistline(腰围) started to (开始)expand(膨胀, 扩大). 3.D.问题问“二十世纪七十年代发生了什么?”利用问题句中的特征词1970s作为答案线索,在文章第3段中找到答案相关句 “Clean your plate and!” “Be a member of the clean-plate club!” Just about every kid in the US has heard this from a parent or grandparent.often,its accompanied by an appeal:“Just think about those Starving orphans in Africa!”Sare,we should be grateful for every bite of food. Unfortunately, many people in the US take too many bites3.Instead of staying “clean the plate”, perhaps we should save some food for tomorrow. According to news reports,US restaurants are partly to blame for the growing bellies.A waiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government,according to a USA Today story4.(第2题答案相关句)Americans traditionally associate quantity with value and most restaurants try to give them that.They prefer to have customers complain about too much food rather than too little. Barbara Rolls,a nutrition(营养学) professor(教授) at Pennsylvania State University(宾夕法尼亚州大学), told USA Today that restaurant portion sizes(尺寸, 大小) began to (开始)grow(增长, 增加) in the 1970s,the same time that the American waistline (选项D中的细节信息词)began to expand(扩大). 答案相关句说“一位滨洲大学营养学教授Barbara Rolls告诉《今日美国》二十世纪七十年代饭馆给的饭菜量开始增加,与此同时,美国人的腰围也开始增大”, 因此选项D正确。