— Having many helpers makes a task easier and faster to finish.
— I think so.
A：Many hands make light work.
B：Practice makes perfect.
C：The early bird catches the worm.
D：Actions speak louder than words.
世界最大的黄土堆积区指____。
梁启超曾把中国古代的某一机构比喻成“将留声机器所传之声，按字誉出的写字机器”。这一机构是（ ）
已知发f(x-1x)=x2+1x2，则函数f（3）= ____
