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问题详情：

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The Consumer Electronics Show, one of the largest technology shows in the world, is held yearly in America. Each year’s show has specific trends, which help companies predict electronic devices that will become popular with consumers.

One trend at this year’s show is Ultra HD TVs, whose picture is much better than that of regular TVs. The maker Samsung says only nine Ultra HD televisions are available now. Television manufacturer LG introduces curved(弯曲的）television designs. And Sony displays its televisions using the Android operating system.

Another trend is the practice of connecting home devices to the Internet. People can now connect household electrical appliances, such as dishwashers, stoves, and refridgerators. However, developers have to invent a way for all the devices to be able to communicate with each other.

The 3-D electronic product is the most attractive category. Because of the large growth in 3-D printers manufactured in the past year, prices are much lower. There is also a new 3-D pen which allows users to draw 3-D objects. A large number of people show great interest in both the printer and the pen.

The wearable devices are amazing. A special helmet uses light to grow hair on a person’s head. A necklace connected to a mobile phone can send a message in case of an emergency. There is a ring that can be used to control other devices just using hand movements.

As usual, robots are also shown at this year’s show. Some of them make it easier for children to learn computer programming. Others can help create a virtual(虚拟的）version of a person, so someone can be in one place and appear to be in another place at the same time. Unfortunately, they may also be used by criminals.

28. People can see some kinds of TVs at the show EXCEPT ______

   A. Ultra HD TVs   B. Curved TVs  C. TVs with the Android system  D. Regular TVs

29. What kind of product may be the most popular at this year’s show?

   A. Robots          B. The wearable devices   

   C. The 3-D electronic product    D. Internet- connected home devices

30. Which of the following is TRUE according to the text?

   A. A new 3-D printer is much more expensive now

   B. A necklace can help call for help if necessary

   C. The electronic devices on show are all American products

   D. Home devices can keep in contact with each other

31. What can we learn from the last paragraph?

   A. It’s against the law to use a virtual version of a person

   B. New technology may be put to bad purposes

   C. Some robots are invented to replace teachers

   D. Robots are a new exhibition at this year’s show.

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