贝加尔湖(如下图所示)形成于2500万年前，是世界上最深和蓄水量最大的淡水湖，面积居世界第七位。湖泊周围人迹罕至，原始森林茂盛。湖水清澈透明，湖中有植物600种，水生动物1200种。湖中大量的端足类动物能够分解水藻，分解动物尸体。贝加尔湖地区常会出现大风天气。在距湖岸100-200米的沙土山坡上生长着高大粗壮的松树,2-3米高的树根裸露地面，当地人称之为“高跷树”。贝加尔湖共有300余条河流注入，从湖中流出的仅有安加拉河。当地居民对是否在贝加尔湖畔建瓶装水厂存在较大争议。

臭氧在烟气脱硝中的反应为2NO₂（g）+O₃（g）⇌N₂O₅（g）+O₂（g）．若此反应在恒容密闭容器中进行，相关图象如下列选项，其中对应分析结论正确的是（　　）

下列句子中加下划线词的用法与其他三项不同的一项是（   ）

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.