2010年，中国国内生产总值达到了5.88万亿美元，超过了日本的5.50万亿美元，成为了世界第（）大经济体。
A、一
B、二
C、三
D、四
参考答案：B
—Which one would you like to work for in the following groups, Li Mei?
—Let me see. I'd like to work for _____ because this group helps children in poor countries. [ ]
A. Greenpeace
B. NBA
C. UNICEF
D. WTO
耙装机安装固定楔眼最好与工作面成（）的偏角。
A.2～3°
B.3～4°
C.4～5°
D.5～7°
