.---You seemed to have been impressed by his songs.

---Well, not exactly so. It was his way of singing____ his voice that really impressed me.

A．rather than

B．as well as

C．but also

D．together with

对高程测量，用水平面代替水准面的限度是( )。

A．在以10km为半径的范围内可以代替

B．在以20km为半径的范围内可以代替

C．不论多大范围，都可代替

D．不得代替