当人连接不断的受到挫折，便会感到自己对一切都无能为力，丧失信心，这种心理状态是（）

A．忧愁感

B．习得性无助感

C．抑郁感

D．焦虑感

The students were all _______ when they heard the _______ news.

A. excited; exciting       B. exciting; excited       C. exciting, exciting