单选题 ______ conventional economic theories, Prof. Marcus warned that developing countries' excessive interest in labor-intensive production will undermine their potential of development in the long run.

A. By contrast
B. In addition to
C. In contrast to
D. With regard to

【正确答案】 C

【答案解析】in contrast to“与……相反”；by contrast“对比之下”；in addition to“此外”；with regard to“关于”。题句意为：“与传统的经济理论完全不同，Marcus教授告诫大家，发展中国家的劳动力密集型生产从长远观点看将削弱他们发展的潜力。”