题目

Of all the things we eat and drink，water is the  1 important.The human body can go 2    food for a long time，but two  3 three days without water could make people  4 .A lot of people don’t understand how  5 water the human body needs  6 well and many people don’t drink enough，esecially in  7 weather. Most people drink  8 they are thirsty but in fact they need more water，expecially when they take  9 .A man’s body is 65 to 75 percent of  10 . If we don’t have enough water. We fell tired and may become ill.1.A.more  B.most  C.less  D.least2.A.with  B.on 已知an=∫n0（2x+1）dx，数列{1an}的前n项和为Sn，bn=n-33，n∈N*，则bnSn的最小值为______．