假如你是某家英文报社的编辑，昨日收到一位中学生读者王丽的来信。请根据来信内容用英语写一封回信。词数120左右。

Dear Editor,

I am a hardworking girl and want to do well in my lessons．But in the exams, I always make mistakes that I should have avoided．I really worry about it．What can I do to improve my performance in exams?

Wang Li

注意：信的开头和结尾已给出，不计人总词数。

Dear Wang Lin，

Editor

喷枪气压调节过大会导致银粉色（）。

A.变色

B.变浅

C.变深