色彩的明度最低的是()。
A.红色
B.黄色
C.紫色
D.绿色
参考答案:C
I thought the teacher would say something about our exam result but he ________ it.
A.doesn't mention
B.hasn't mentioned
C.wouldn't mention
D.didn't mention
简述拿五经法的操作及适应证。