．________boys and girls in that school are almost equal, of which both of the headmasters are proud.

A．A number of

B．The numbers of

C．Numbers of

D．The number of

支付图书稿费的字数一般按实有正文计算，即以排印的版面（）计算。

A.扣除各种空白后的文字数量

B.每行字数乘以每面可排行数

C.每行字数乘以全部实有行数

D.千字数计算，即每面不足500字的按千字作半，超过500字的按千字