限地性原料的参用程度愈大，原料指数也愈大。( )
参考答案：对
Elvis Presley has sold more than one______ records all his life.
A．billion
B．billion of
C．billions of
D．billions
阑尾解剖位置的体表投影应当是（）.
A.通过脐横线与右锁骨中线的交点
B.脐与右髂前上棘连线中内1/3处
C.右腹股沟中点与脐连线的中外1/3处
D.脐与右髂前上棘连线的中外1/3处
E.位置不定，经常变异
