B
Americans usually eat three meals a day. Breakfast is always before eight o'clock in the morning. They usually have eggs，some meat，bread，fruit，juice and coffee at home. Lunch is between twelve and one o'clock. Lunch is a light meal. Some people have to have lunch near their workplace. The students take sandwiches，fruit and cookies with them to eat in school.
Dinner，the main meal，is between six and eight o'clock in the evening. People cook it carefully. They may have meat or chicken，turkey(火鸡) or duck. They may also have potatoes or rice，vegetables or salad. The drink is coffee，tea or milk. Then comes the dessert(甜点).
()16. In the morning，Americans always have breakfast .
A. at eight o'clock B. after eight o'clock
C. before eight o'clock D. before six o'clock
()17. The most important meal for Americans is .
A. breakfast B. lunch C. brunch D. dinner
()18. Americans usually have breakfast and dinner at .
A. home B. the workplace C. school D. the restaurant
()19. When Americans have dinner， comes last.
A. drink B. rice C. dessert D. salad
()20. The passage mainly talks about .
A. American schools B. American sports
C. American food D. American meals

16－20 CDACD

【分析】本题为阅读理解细节题与主旨大意题，需结合原文内容逐一对应选项：16题定位早餐时间；17题找主餐；18题找早餐和晚餐的地点；19题找晚餐最后一项；20题概括文章主题。
【解析】16题：根据原文第一段“Breakfast is always before eight o'clock in the morning.”可知，美国人早餐在八点前，选C；17题：原文第二段“Dinner，the main meal”说明晚餐是最重要的一餐，选D；18题：第一段提到早餐在家吃，第二段晚餐人们会仔细烹饪，可知早餐和晚餐在家，选A；19题：原文第二段最后“Then comes the dessert”说明晚餐最后是甜点，选C；20题：全文围绕美国人的一日三餐展开，选D。
【答案】CDACD
【知识点】阅读理解细节理解题，主旨大意题
【点评】本题考查学生对英语阅读理解中细节信息的定位能力和主旨概括能力，题目难度不大，只要仔细阅读原文即可正确作答。
【难度系数】0.7