45. The smile of the Mona Lisa can only be seen ________.

A. by indirect vision B. at a distance C. by direct vision D. in shadows

46. Choose the right order about the happenings onto Mona Lisa.

a. It was stolen from the Louver.

b. Its painter sold it to King Francis I.

c. Its state of health was checked.

d. It was returned to France and housed in the Louver Museum.

e. It was hidden and protected against Germans.

A. b-a-d-e-c B. d-e-c-b-a C. d-a-e-c-b D. b-c-a-d-e

47. It may add to the difficulty in repairing the painting in that ________.

A. experts haven’t noticed changes in its shape as visitors do

B. it is likely to be stolen again when it’s under repair

C. it is uncertain which country, Italy or France, should take charge

D. experts aren’t sure about the materials and the chemical state of its oil paint

D

Imagine you’re at a party full of strangers. You’re nervous. Who are these people? How do you start a conversation? Fortunately, you’ve got a thing that sends out energy at tiny chips in everyone’s name tag (标签). The chips send back name, job, hobbies, and the time available for meeting---whatever. Making new friends becomes simple.

This hasn’t quite happened in real life. But the world is already experiencing a revolution using RFID technology.

An RFID tag with a tiny chip can be fixed in a product, under your pet’s skin, even under your own skin. Passive RFID tags have no energy source---batteries because they do not need it. The energy comes from the reader, a scanning device, which sends out energy (for example, radio waves) that starts up the tag immediately.

Such a tag carries information specific to that object, and the data can be updated. Already, RFID technology is used for recognizing each car or truck on the road and it might appear in your passport. Doctors can put a tiny chip under the skin that will help locate and obtain a patient’s medical records. At a nightclub in Paris or in New York the same chip gets you into the VIP (very important person) section and pays for the bill with the wave of an arm.

Take a step back: 10 or 12 years ago, you would have heard about the coming age of computing. One example always seemed to surface: Your refrigerator would know when you needed to buy more milk. The concept was that computer chips could be put everywhere and send information in a smart network that would make ordinary life simpler.

RFID tags are a small part of this phenomenon. “The world is going to be a loosely coupled set of individual small devices, connected wirelessly,” predicts Dr.J.Reich. Human right supporters are nervous about the possibilities of such technology. It goes too far tracking school kids through RFID tags, they say. We imagine a world in which a beer company could find out not only when you bought a beer but also when you drank it. And how many beers. Accompanied by how many biscuits.

When Marconi invented radio, he thought it would be used for ship-to-shore communication. Not for pop music. Who knows how RFID and related technologies will be used in the future. Here’s a wild guess: Not for buying milk.