I am about the new model, and I firmly believe that there will be a good market for it.

网友回答

A. concerned
B. doubtful
(答案→)C. confident
D. particular
解析：
试题分析: 句意：我对新的样品很有信心，我坚定地相信它会有很好的市场。A be concerned about“关心，担心”；B be doubtful about “对……怀疑”；C be confident about “对……有信心的”；D be particular about “对……挑剔。从句意可知答案选C。