第13题: [单项选择]The most favorable business ecology in Silicon Valley is characterized by A. its waste products of success. B. its abundance in constructive failures. C. its solid foundation for innovations. D. its laid-off dot-com programmers. 参考答案:B 答案解析:题干问:“硅谷企业环境最有利因素的特征是……。”根据原文第2自然段的阐述,它的特征是“它丰富的建设性的失败”。而选项[A]“它的太多的无用的成功”,[C]“它的对革新的坚强基础”以及[D]“它的解雇的