E-mail, as well as telephones, _____ an important part in daily communication.[ ]

A. is playing      

B. have played    

C. are playing      

D. play

南方丘陵山区农业资源的优势，表现在

A．季风活动使本区光、热、水资源丰富，配合好，农业气象灾害较少发生

B．优越的气候条件和多样的土地类型使本区生物品种多，生长快，更新能力强

C．气候、生物、土壤的垂直分异使本区土地类型多样，水土流失严重

D．温暖湿润的环境条件使本区酸、瘦、黏的低产红壤广泛分布