单项选择题
A．there are more than enough women in the labor force B．women have more freedom in selecting jobs C．women are only provided with low-paid jobs D．women are less experienced than men
A．important to Americans B．useful for children only C．used as a telephone D．only used by doctors
A．the production of new industrial goods B．increased amounts of unnatural substance C．our ever-increasing population D．the release of artificial substances into the environment