Bluetooth is a radio-technology which provides tech supports for short range communication, allowing cell-phones, PDA, wireless earphones, notebook computers etc to exchange radio signals, so that electronic appliances with Bluetooth can contact each other within 10 metres．
“Bluetooth” comes from the king of Denmark Harald Gormsson’s nickname．Born of a pirate’s family, Harald later united the countries of North Europe and became king of the Viking Kingdom．Because he liked eating blue strawberries, his teeth were always dyed blue, hence the nickname．Blue strawberries were at that time regarded as inadvisable food owing to the ugly colour, so the king became the symbol of bravery in making daring attempts．In 1998, hoping to standardize radio communication technologies Ericsson named the new technology standard Bluetooth．
Later, on May 20, 1999, the leading companies in the field like Sony Ericsson, IBM, Intel, Toshiba and so on set up Bluetooth Special Interest Group(SIG)and worked out Bluetooth technology standards．
Bluetooth has a fast-increasing number of supporters and sharers, from five members of SIG in the beginning up to today’s nearly 3000 member corporations．Its development can be roughly divided into three stages．
First stage(2001～2002)：Bluetooth was applied to high-end products as accessories, such as earphones for cell-phones, cards for notebook computers, or to the special occasions where only its capabilities and functions were strictly demanded but not its price．
Second stage(2002～2005)：Bluetooth was applied to mid-and high-grade products, such as PDA, cell-phones, notebook computers and so on．Its price went down to 10 doctors for each chip．
Third stage(since 2005)：Bluetooth has stepped into household appliances, digital cameras and other electronic products．Bluetooth networks are everywhere and its price is 2～5 dollars．It is quite common that a person has two or three Bluetooth products．
Bluetooth has a promising future; the rapid development of communication technology will provide it with even larger markets．It is predicted to have 3 billion users by the end of 2010．Bluetooth’s target market is low-end wireless networked field, and its original intention is providing simple and convenient wireless networked technology．
(1)
Bluetooth is intended to ________．
[ ]
A．
communicate between different electronic appliances at any distance
B．
connect different electronic appliances wirelessly within short distance
C．
provide tech supports for various electronic appliances to communicate
D．
allow different electronic appliances to contact with wires within 10 metres
(2)
Why did Ericsson name a new technology standard Bluetooth?
[ ]
A．
Because all the products of the new technology are blue．
B．
Because Bluetooth is the nickname of the king of Ericsson．
C．
Because they think they are as brave in making attempts．
D．
Because their products are as ugly as blue strawberries．
(3)
From the three stages we may draw a conclusion that Bluetooth technology has been becoming ________．
