题目

第二节：语法填空（共10小题；每小题1分, 满分10分） We eat for many different reasons but not always for the right reason. Most people choose to eat something just   26   the food tastes delicious.   27  , if we choose based   28   taste alone, regardless of nutrition(营养) or healthy eating habits, then gaining weight is inevitable. Changing your eating habits means   29   you need to look at the nutritional value as well as the amount of fat. Healthy eating habits come from eating foods that are low   30   fat. Learn to read labels so that you can make13．已知数列{an}是公差d＞0的等差数列，且a2+a3=7，a2•a3=12，数列{bn}是等比数列，公比q=b1=$\frac{4}{9}$a1．（1）求数列{an}和数列{bn}的通项公式；（2）设cn=an•bn，试判断数列{cn}是否有最大值；若有最大值，则求出第几项最大，最大值是多少？若没有，请说明理由．