单选题 According to the passage, important inventions of the twentieth century ______.

A、 are not necessarily produced as a result of governmental support for military weapons research and development.
B、 came primarily from the huge laboratories of monopoly industries
C、 were produced at least as frequently by independent inventors as by research teams
D、 have greater impact on smaller firms than on conglomerates

【正确答案】 C

【答案解析】[参考译文]二十世纪重大发明… [试题分析]此题考查对段落大意的把握。 [详细解答]第一段清楚表明C为正确的。