如图，四边形ABCD中，∠ABC=∠ADC=90°，BD⊥AC，垂足为P．

获得2016年国家最高科学技术奖的赵忠贤院士曾对他的学生们说：“我们年轻时，条件艰苦到在被窝里捉老鼠。现在国家科研条件越来越好，大家要撸起袖子加油干。”对这句话的理解正确的是（    ）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（＼）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1．每处错误及其修改均仅限一词；2．只允许修改10处，多者（从第11处起）不计分。
    My high school life has made me learn many things. Between them teamwork is the most significantly for me. In fact, I didn't realize its importance after I was elected monitor. In the begin, I did almost all the duties myself, however, others students cared little about class activities. Therefore, I worn out and depressed. Then I turned to my head teacher but he advised me to cooperate with others. Gradually, I realized the strengths of my classmates and managed to have everyone to play a part in class. It is working in teams instead of on my own which has freed me of trouble and make my work more efficient.

不等式组 $\{\begin{array}{c}x<8\\ x>m\end{array}$ 有解，m的取值范围是____．

人体的八大系统是____ 系统、____ 系统、____ 系统、____ 系统、____ 系统、____ 系统、____ 系统、____ 系统，这八大系统协调配合，使人体内各种复杂的生命活动能正常进行。