对运输商评估的综合选择法步骤是（）。

A.将不同运输商按承运量排列成等级

B.将评估参数按重要性安排成序列

C.越重要的参数其权数越大

D.计算综合因素数值，选择最高数值的运输商

Each boy and each girl as well as some teachers who ______ to participate the Marathon _______ required to be at the school gate at 2:30 pm..

A．are; is

B．are; are

C．is; are

D．is; is