指出划线部分的语法现象。(1)A second area where the U.S. and Europe differed is in the humble matter of phone numbers.(2)Cordless telephones are devices consiting of a base station and a handset.(3)This decision resulted in different manufacturers producing different kinds of mobile phones.(4)There is a buffer about two cells wide, providing for good separation and low interference.(5)At the center of each cell is a base station to which all the phones in the cell transmit.