题目

北京高新技术产业园区发展的主导因素是（    ） A. 快捷、便利的交通                      B. 有高等院校和科研机构的支持 C. 气候宜人、环境优美                    D. 稳定的较大比重的军事订货 答案：B—  Sorry, I've kept you waiting. —  It's all right. I _____ newspapers all the time. [     ]A. am reading B. had read C. was reading D. have been reading