20世纪初，世界上最畅销的纯碱是“红三角”牌纯碱。为中国的制碱工业做出突出贡献的科学家是 [ ]
A、张謇
B、詹天佑
C、侯德榜
D、邓稼先
答案：C
-Are you sure you have ______ all the documents in your list?
-Oh, sorry, I forgot to ______ the one you had sent me. [ ]
A. included; contain
B. listed; include
C. listed; be included
D. contained; listed
最经典型的纯公共物品是（）。
A.国防
B.教育
C.医疗卫生
D.交通运输
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