题目内容：

    The next time a giant Big Mac or Coke flashes into your mind when you’re walking home from the pub, you may not simply have the snacks. And that picture of the model putting on Chanel — no, you’re not daydreaming.

A British startup has created a new advertising system that uses lasers to project images up to 200 metres tall from the sides of tall buildings, enabling advertisers to reach people from virtual billboards（广告牌）in the sky. Passers-by will see each image for only between one tenth and quarter of a second, as their eye eye catches the light from certain angles.

Advertising agencies and big businesses have already signalled their interest, but Skyline campaigners have branded the technology “greedy” and said that it could fill our skies with showy and tasteless brands.

The Echo system, from Lightvert, uses a high laser projector to bounce light off a narrow reflective strip fixed to the side of a building, visible up to 1km away. This creates large-scale images that are captured briefly in the viewer’s eye as a result of the “persistence of vision” effect: the same effect that leaves an imprint of a light source on your vision after you’ve turned away.

Daniel Siden, the technology’s inventor, explained: People often think this could be subversive, but it’s not subliminal advertising（隐性广告）as the imagery registers on the conscious level. It’s actually less invasive and more fun than traditional advertising. Mr.Siden said that planning experts have indicated that planning permission should not be a problem outside of conservation area. He said that the system was safe because of the distance between the projector and passers by. And images would be above the line of sight of drivers and cyclists

and below the field of vision of airline pilot. The images have been tested and shown not to cause epileptic seizures（癫痫发作）.

Because it uses only one strip of reflected light, the system needs a small amount of the power, about one-twentieth of a standard 96-sheet digital outdoor display for an image of the same height.

The owners of high-rise properties could use the system to make large returns from installing the laser projector and reflective strip. The company puts the cost of a unit measuring 100 metres at under ￡750,000, based on the present design, anticipating that costs will drop.

Still, some Skyline campaigners dislike the technology and believe it delivers subliminal advertising. Barbara Weiss of the Skyline Campaign, said: “It’s actually offensive. London’s latest tall buildings are not particularly well-built or well designed, but unfortunately people are forced to look at them. Adding stupid advertising that’s invasive in its nature will only make it worse.”

1.Why does the writer cite the example of Big Mac, Coke and Chanel in paragraph 1?

A.Because he attempts to promote these products to potential consumers.

B.Because he studies the association between products and images in advertising.

C.Because he tries to illustrate the effectiveness of flashing images of advertised goods.

D.Because he wants to introduce a new advertising technology to readers.

2.Which of the following statements about the Echo system is true according to the passage?

A.Pedestrians can see the flashing images on one side of the building from specific angles.

B.The system is composed of a laser projector, a reflective strip and a physical billboard.

C.The image lasts between one tenth and quarter of a second in vision even if you turn away.

D.It’s a new advertising system developed by a time-honored British company.

3.The underlined word “subversive” in paragraph 5 probably means ________.

A.Subconscious B.trouble making

C.harmless D.imaginative

4.Which party is likely to set obstacles to the application of the Echo System?

A.Environmentalists worried about energy consumption.

B.Drivers, cyclists and pilots whose sight might be affected.

C.The Skyline Campaign regarding the image as flashy.

D.The patients who suffer from epileptic seizures.