砂土为( )的土。

A．粒径大于3mm的颗粒含量不超过全重60%
B．粒径大于0.075mm的颗粒超过全重60%
C．粒径大于1mm的颗粒含量不超过全重50%且粒径大于0.075mm的颗粒含量超过全重50%
D．粒径大于2mm的颗粒含量不超过全重50%且粒径大于0.075mm的颗粒含量超过全重50%

Those story books for children are awfully written. They are             interesting             exciting. [ ]

A.either ; or

B.neither ; nor

C.both ; and

D.not only ; but also