用秦九韶算法计算当x=0.1时，多项式f（x）=2x6+3x5+4x4+5x3+6x2+7x+8的值，需要做乘法和加法运算的次数分别是（ ）
A：6，6
B：5，6
C：5，5
D：6，5
单位换算：
A number of children ________ parents had died in the quake were sent to live with families in other cities.
加油站必须粘贴的标志是（ ）
