[单选题]

28． The number of listeners is becoming larger because
__________．
A． the radio is easy to carry
B． the radio is good for blind people and many old people
C． the radio can be used at any time
D．A，B and C

28． The number of listeners is becoming larger because__________．A． the radio is easy to carryB． the radio is good for blind people and many old peopleC． the radio can be used at any timeD．A，B and C