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Bluetooth is a universal radio interface in the (1) frequency band  that enables portable celectronic devices (2) connect and  communicate (3) via short range,ad hoc networks.Each unit can  simultaneously communicate with up to (4) other units per piconet.  Moreover,each unit can simultaneously (5) to several  piconets,Bluetooth technology which apart from Ericsson,has gained  the support of  Nokia,IBM,Toshiba,Intel and many other  manufactures,eliminates the need for wires,cables and connectors    for and between cordless or mobile phones,modems,headsets,PDAs,      Computes,printers,progjectors,local  ares networks,and so on ,and paves the way for new and completely  different devices and applications. 
(1). A.2.45GHz  B. 4.45GHz    C. 2.95GHz    D. 3.45GHz 
(2). A.in      B. on          C. to    D. with 
(3). A.narrowly  B.wirelessly  C.freely  D.widely 
(4). A.use      B.sever      C.host    D.base 
(5). A.relate    B.add      C.close    D.belong 
´ð°¸:1:A,2:C,3:B,4:B,5:D