Picture this scene. You wake up on a school morning, and you know you're 1. Maybe your throat is sore. Maybe your head hurts. Whatever the 2 is, your mum or your dad sends you back to bed to rest. This 3 to every kid once in a while, right?

    Wrong. And the living proof (证据) is eighteen-year-old Travis Schmidt. From his first day of kindergarten (幼儿园) to his last day of high school, Travis 4 stayed home sick. At first, Travis didn't think too much about never being absent (缺席的). But then he reached third grade with perfect attendance (出勤率). At that point, Travis decided to see how 5 he could keep it up.

    So how did Travis successfully keep 13 years of perfect attendance? In the first place, he's a very heathy kid. Although he got colds like everyone else, Travis never felt sick enough to stay home. Travis also 6 ahead (提前地). For example, he knew he'd 7 get chickenpox (水痘) sooner or later. So when a friend caught chickenpox one summer, Travis made sure to 8 him. A few days later, he was covered with poxes. But he had quite a lot of 9 to get better before school started in autumn.

    Travis is 10 his record. "I may not be the smartest or the coolest. But I'm always there," he says.

圆形养鱼池，直径是4米，这个养鱼池的周长是多少米

资料显示：我国人均资源量排名120位，工业用水重复利用率比世界先进水平低25%左右，而单位国内生产总值废水排放量比发达国家高出四倍，一些单位产品污染排放量比发达国家高出10倍以上。下面做法有利于解决上述问题的有（   ）
①实行跨区域调配                                 ②加强有关部门的执法监督力度
③利用科技提高资源的利用率             ④计划生育