单项选择题 Computers in ____ sectors have seen their shares tumble some 10%since the start of the year.protectedC、 keptD、 keeping

单项选择题 Thousands of service-company employees who work for big regulated industries may now also see their future ____.threatB、 threateningC、 threatenedD、 threading

单项选择题 今天的大多数经济学家都认为，创业精神是在各类社会中刺激经济增长和创造()机会的一个必要因素。