蜈蚣研末服用的常用量是（）
A.10～15g
B.3～10g
C.3～5g
D.1～3g
E.0.6～1g
参考答案：E
韦伯提出的法定权力是（）。
I'm afraid this painting is not by Picasso. It's only a copy, so it's ______ .
[ ]
A. priceless
B. invaluable
C. unworthy
D. worthless
