13．She works as a typist in a company．However, she doesn’t like the work, because _____ calls for patience and speed．

A．which

B．it

C．what

D．She

碎屑颗粒：石英60%、微斜长石18%、钠长石8%、云母1%、碎屑绿泥石1%、燧石2%、脉石英3%、细粒石英岩屑1%、粘土岩岩屑3%、千枚岩岩屑1%、花岗岩岩屑1%、流纹岩岩屑1%；粘土杂基10%。该岩石名称是：（）

A、石英砂岩；

B、长石砂岩；

C、岩屑砂岩；

D、长石岩屑砂岩