题目

已知∠AOB=3∠BOC,若∠BOC=30°,则∠AOC等于(   )   A.120°    B.120°或60°   C.30°   D.30°或90° 答案：  B10. Humorously he argued that talk of economic hardship seems        on a sunny April day in Barcelona,one of Spain's most prosperous cities.   A. out of place   B. out of shape   C. out of question   D. out of control