It seems there are________people out of work.Something must be done to create more employment.
A:a great many
B:a great many of
C:a great deal
D:a great deal of
已知函数f(x)=23sinxcosx+2cos2x+m在区间0,π3上的最大值为2.求常数m的值;
赤壁
杜牧
折戟沉沙铁未销,
自将磨洗认前朝。
东风不与周郎便,
铜雀春深锁二乔。
大树底下好乘凉主要是因为植物的( )