No more batteries ,no more chargers and no more wires.This i

No more batteries ,no more chargers and no more wires.This is the 21 promised by “wireless power” ,a means of broadcasting 22 through the air to laptops,Ipods and other machine without the need for cable and sockets.
Wireless lighting,audio speakers and digital picture frames are expected to be among the first commercial products to be 23 to the publiv.
Experts believe that wireless electricity will 24 change the way in which we live.In a world without wires your machine would start 25 electricity as soon as you entered the room.
You would no longer have to 26 mobile phones running out of power because once you walkd through the front door your mobile would charging up—even while still in your bag or pocket.You would never need to hurt for the right 27 again.
The technology works by turning electricity into an invisible laser(激光),then sends it across the room to a battery that 28 it back into electricity.
Currently the laser can only crease,enough electricity to power a small light about 10 metres away but experts say both,the power and 29 will quickly increase.
The technology also 30 to save energy because it would only power products when needed.
21 A time B chance C future D case
22 A lighting B electricity C programme D information
23 A available B possible C reliable D renewable
24 A constantly B instantly C reasonably D eventually
25 A sending B receiving C producting D operating
26 A worry about B look for C think of D adapt to
27 A mobile B room C charger D laser
28 A translates B transforms C confirms D relates
29 A cost B need C speed D distance
30 A continutes B requires C promises D limits

21 C
22 C
23 A
24 D
25 B
26 A
27 C
28 B
29 D
30 C