问题补充:
Im afraid this painting is not by Picasso. Its only a copy and so its .
A. priceless
B. invaluable
C. unworthy
D. worthless
答案:
A. priceless
B. invaluable
C. unworthy
D. worthless
解析: worthless 无价值的, 无用的。Priceless 无价的, 贵重的, 无法估价的:a priceless treasure 无价之宝。Invaluable 无法估价的, 非常宝贵的。Unworthy 不值得的, 不配的; 无价值的。