口内直接法制作桩核蜡型时根面和根管内应涂一薄层（）
A.蒸馏水
B.单体
C.液体石蜡
D.乙醇
E.碘酒
参考答案：C
On the bank of the river, we found him ________ on a beach, with his eyes _____ on a kite in the sky.
A．seated; fixing
B．sitting; fixing
C．seated; fixed
D．sitting; being fixed
延胡索来源于( )
A．蓼科B．毛茛科C．桑科D．罂粟科E．十字花科
