It was obvious that the Climate Change Conference in Copenhagen became the ________ of media

attention.[ ]

A. discovery  

B. focus

C. summary  

D. comment

华尔兹舞音乐尤其是音乐大师（）创作的华尔兹舞曲，使华尔兹成为“舞蹈之王”。

A.莫扎特

B.肖邦

C.施特劳斯

D.柴可夫斯基