阅读材料,回答下列问题。

材料一 湄公河发源于中国青海省,注入南海,在中国境内称澜沧江,出境后称湄公河。澜沧江-湄公河流域资源丰富,人口众多,但经济社会发展水平并不高。

材料二 受强厄尔尼诺的影响,2015年底以来,澜沧江-湄公河流域遭受异常严重旱灾。中国于2016年3月15日开始经景洪水电站对下游实施应急补水,以帮助缓解旱情。为致力于区域经济社会的可持续发展,该流域各国在不同领域开展了广泛的合作。

材料三 图14 为澜沧江-湄公河示意图,15 为流域内三城市的气候资料图。

先天性脑瘫的王甦菁，不向命运低头，自学多年，终于成为吉林大学计算机科学与技术学院的博士，赢得国际学术界认可，被网友称为“中国版霍金”。这则材料说明的道理是（    ）

根据短文内容和首字母提示，在下文空格处填入适当的词使短文完善（每空一词）

Frank was a curious boy. The first time he saw an hourglass(沙漏),he wondered what it was.

His mother said,”An hourglass is made in the s   ____   of 8. The sand is put in at one end,and runs through a small hole in the m ____  . It takes the sand exactly an hour to run through.”

Frank  w ____  the little stream of sand. He was i ____ ,because it would not run faster. ‘Let me shake it,mother,”said he,”it is lazy,and will never get through.”

“It will,Son,”said his mother, “The sand moves little by little,but it moves all the time. When you look at the hands of the clock, you think they go very s  ____   , but they never stop. While you are at play,the sand is r  ____  , grain by grain. The hands of the clock are moving,second by second. At night,the sand in the hourglass has run through twelve times. The hour hand of the clock has moved a ____ its great face. That is because they keep working every minute. They do not stop to t  ____ how much they have to do and how long it will take them to do it.”

   Now, Frank’s mother wanted him to learn a little poem,but he said,‘Mother,I can never learn i  ____   ,”His mother said,”Study all the time.N  ____  stop to ask how long it will take to learn it.”

   Frank followed his mother’s advice. He studied line after line,very busily; and in one and a half hours he knew the poem perfectly.