证书认证中心对证书的管理不包括（）。
A、证书的签发
B、证书的撤消
C、证书的销毁
D、证书秘钥管理
参考答案：D
His great success ________ his hard training every day. [ ]
A. contributed to
B. thanked to
C. resulted in
D. was due to
“雁柱十三弦，一一春笃语。”出自于欧阳修的《生查子含羞整翠鬟》，其中的“雁柱十三弦”是指哪种乐器？
