题目

 Surfing for hours on the Internet consumes a lot of electricity and is harmful to the   environment. However, a new ecological PC saves energy as it operates：it produces about 70   percent less CO2 than conventional computers. As a work tool, a leisure activity resource, and a personal assistant, computers seem to be   everywhere. Yet the environmental performance for today's computers leaves a lot to be   improved: they rapidly become out of date, and typically contain poisonous materials and   individual parts that are difficult to recycle. Moreover, they consume plent九年级一班5名女生进行体育测试，她们的成绩分别为70，80，85，75，85（单位：分），这次测试成绩的众数和中位数分别是（ ）A．79，85B．80，79C．85，80D．85，85