盲人“读”盲文时，是依靠皮肤中的（　　）

小明想把重1000N的木箱A搬到高h=5m，长L=10m的斜面上，如图所示．他站在斜面上，沿斜面向上用F=600N的拉力使木箱A以v=0.2m/s的速度匀速从斜面底端拉到斜面顶端．求：

阅读理解

      MOST recently, my world has been shaken by the death of a teacher at my school.He was Dr.Allan Woolley and he was only 52.Suddenly he took his own life, which remains a mystery.

      That morning, everyone sensed that something wasn't right.During our lessons, an announcement was made that an assembly was scheduled for morning break, which was only done in emergencies.

      Once morning break came, the entire school gathered in the main hall.As our headmaster marched out to announce the “momentous news”， it felt like the air around us trembled.Many students broke down in tears, and the reaction afterward was intensely powerful and unifying.

    The headmaster said that students were allowed to miss lessons and have a free period to collect themselves if they found the news too distressing.Many students went outside and shared memories of Dr.Woolley to control themselves.

     Dr.Woolley taught me chemistry two years ago, but up until his death he still taught many of my close friends.Many of my friends were so shocked that they still couldn't believe the person that they had owed some homework to was now dead.

      It was heart­warming to spend time with teachers that morning and get to know more about them.Despite the time of sadness, I feel that every cloud has a silver lining.Although Dr.Woolley's death is something nobody wanted to see, we must move on．

Notes：

①assembly n．集会　②schedule vt.安排　③momentous adj.重大的　④unifying adj.统一的　⑤distressing adj.悲伤的

品读曹操《观沧海》，按要求回答问题。

东临碣石，以观沧海。水何澹澹，山岛竦峙。

树木丛生，百草丰茂。秋风萧瑟，洪波涌起。

日月之行，若出其中；星汉灿烂，若出其里。

幸甚至哉，歌以咏志。

请对本诗画线句作简要赏析。