题目

阅读下面短文，从短文后所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 In many countries，people eat rice every day．1they eat it two or three times a day, for breakfast, lunch and supper．They can 2it, fry（煎）it or 3it into rice noodles．They usually eat it 4meat，fish and vegetables． Some people do not eat some kind of 5 ． Muslins，for example，do not eat pork，and Hindus do not eat beef． The Japanese eat a lot of fish．Japan is an island and its 6go all over the Pacific looking for fish to 7 ． The Japanese sometimes e设数列{an}中的前n项和Sn=14(an+1)2，且an＞0．（1）求a1、a2；（2）求{an}的通项；（3）令bn=20-an，求数列{bn}的前多少项和最大？最大值是多少？