There’s nothing more welcoming than a door opening for you._1_ the need to be touched to open or close,automatic doors are essential in _2_ disabled access to buildings and helping provide general _3_ to commercial buildings.Self-sliding doors began to emerge as a commercial product in 1960 after being invented six years _4_ by Americans Dee Horton and Lew Hewitl.They _5_ as a novelty feature,but as their use has grown,their _6_ have extended within our technologically advanced world.Particularly _7_ in busy locations or during times of emergency,the doors _8 _ crowd management by reducing the obstacles put in people’s way.
_9 _ making access both in and out of buildings easier for people,the difference in the way many of these doors open helps reduce the total area _10 _ by them.Automatic doors often open to the side,with the panels sliding across one another.Replacing swing doors,these _11 _ smaller buildings to maximize the usable space inside without having to _12 _ the way for a large,sticking-out door.There are many different types of automatic door,with each _13 _ specific signals to tell them when to open._14 _ these methods differ,the main _15_ remain the same.
Each automatic door system _16 _the light,sound weight or movement in their vicinity as a signal to open.Sensor types are chosen to _17 _ the different environments they are needed in._18_,a busy street might not _19_ a motion-sensored door,as it would constantly be opening for passers-by.A pressure sensitive mat would be more _20_ to limit the surveyed area.
1.A.Through B.Despite C.Besides D.Without
2.A.revealing B.demanding C.improving D.tracing
3.A.experience B.convenience C.guidance D.reference
4.A.previously B.temporarily C.successively D eventually.
5.A.held on B.started out C.settled down D.went by
6.A.relations B.volumes C.benefits D.sources
7.A.useful B.simple C.flexible D.stable
8.A.call for B.yield to C.insist on D.act as
9.A.As well as B.In terms of C.Thanks to D.Rather than
10.A.connected B.shared C.represented D.occupied
11.A.allow B.expect C.require D.direct
12.A.adopt B.lead C.clear D.change
13.A.adapting to B.deriving from C.relying on D.pointing at
14.A.Once B.Since C.Unless D.Although
15.A.records B.positions C.principles D.reasons
16.A.controls B.analyses C.proceeds D.mixes
17.A.decorate B.compare C.protect D.complement
18.A.In conclusion B.By contrast C.For example D.Above all
19.A.identify B.suit C.secure D.include
20.A.appropriate B.obvious C.impressive D.delicate
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