下列程序

i=1

WHILE i＜8

i=i+2

s=2*i+3

WEND

PRINT  s

END

输出的结果是____．

我国黄河、海河、淮河流域用水十分紧张，其主要原因是（ ）

    I like spring. It's my favourite season. It's sunny and warm in spring. We fly kites in spring. I don't like winter. It's very cold. I live(居住)in Beijing. It's very cold now. In Sanya，it's warm in winter. So I go to Sanya with my mum and dad. We go swimming in winter in Sanya.

底面直径和高都是4的圆柱的侧面积为（   ）