要想让一块颜色鲜艳突出醒目，必须用（）颜色衬托它
A.低纯度
B.高纯度
C.同种色
D.类似色
参考答案：C
---Why do you look so worried?
---I’m expecting a call from my son. He London for three days.
A．has been to
B．has been in
C．has gone to
D．has come in
肯氏第l类牙列缺损为（）
A.单侧游离缺失
B.双侧游离缺失
C.间隔缺失
D.非游离缺失
E.前牙缺失
