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Imagine looking at a view of mountaintops and wondering about the name of each peak. Suddenly, above each mountaintop, a name appears on the sky. The words are not written in smoke by skywriting planes. The words are actually not in the sky at all. They come from tiny computers in contact lenses (隐形眼镜).

Computers have become smaller and smaller over the decades. The first computers filled houses. Transistors (晶体管) and then chips allowed computers to become small enough to fit on a desktop, then a laptop, and finally a phone. When experimenting with further contraction in size, developers often have to deal with the limits of human eyesight, which control how small the computers can be and still present visible information.

One new solution employs microprojectors (微型投影机) to create a readable display (显示) for tiny computers. These machines project computer information onto any surface. Though an impressive breakthrough, there are potential problems. Such public displays can lead to privacy concerns; most people do not want their information displayed on a wall for everyone to see. Besides, these projectors are extremely expensive, and their screens give users headaches.

Babak Parviz, a researcher at the University of Washington, created another solution: inventing a screen visible only to a person wearing a contact lens. Parviz created a computer in a contact lens that uses the wearer’s field of vision as the display. To create the display, Parviz took ordinary soft contact lenses with a wirelessly controlled system. At some point, Parviz says, it will be possible to connect the lens to a remote personal computer device such as a cellphone or a laptop. By looking in a certain direction, the wearer sends the computer visual information about what he or she sees. The device then uses this information to point out the names of peaks.

These contact lenses are inserted and removed in much the same way as ordinary contact lenses. In addition, the computers in the lenses won’t block the wearer’s sight at all. Although now the computers are not on lenses treating eyesight problems, Parviz hopes that someday the technology will progress to that level.

1．The contact lenses in the text can ________.

A．treat eyesight problems	B．offer beautiful views of nature
C．project information on wall surface	D．show information about what wearers see

2．The underlined word “contraction” in Paragraph 2 can be replaced by________.

A．expansion	B．spread
C．reduction	D．revolution

3．According to Paragraph 3, the microprojectors ________.

A．put people’s privacy at risk	B．save computer information
C．cause serious illnesses	D．support users’ needs

4．According to the passage, these contact lenses contribute to ________.

A．saving users’ expenses	B．reducing computers’ size
C．limiting the field of vision	D．guarding remote computers

5．What might be the best title for the passage?

A．Tiny Computers, Amazing Sights	B．Smaller Lenses, Closer Views
C．Progress towards Clearness	D．Road to the Small World