题目内容：

    A new keyboard can tell whether you are its owner. The keyboard records information about the typing pattern（模式）and sends it to a computer program. The program then checks to see if the pattern matches the right user. If not, an alarm sounds, and the computer locks the typist out. It locks out everyone else, even if the person knows the password. What's more, this equipment needs no batteries. It collects all the energy it needs from your actions of typing. Besides, the keyboard is also self-cleaning and the keys are free of damage from water, oil and dirt.

The keys of the new keyboard are made of the same inexpensive plastic that might be found on any other standard keyboard. But instead of being smooth, the keys have millions of tiny plastic nanowires（纳米线）on their surface area, increasing the effective contact areas between the plastics and fingers. This guarantees that there's enough power to run the keyboard as someone types.

Liming Dai, a scientist, did not work on the new keyboard, but he thinks the design could be important in getting better performance from a variety of equipment. "It could also be applied to a touch screen, for example, "Dai says. " Then smart phones and notepads could collect energy from someone's actions of typing or drawing. "

"Future work might make the keyboard even more useful, "Dai adds. " A later design might build tiny capacitors onto the nanowires, "he suggests. Capacitors are little devices that temporarily store electric charge. Those might then be LEDs to light a keyboard in the dark.

Zhonglin Wang is a co-designer of the new keyboard. His team has built a working model of the keyboard. "If a company decides to fund（资助）its production, this keyboard could be in stores in as few as two years, "says Wang.

1.How does the new keyboard tell whether you are its owner？

A.By matching the typing pattern to the right user.

B.By sending alarms to a computer program.

C.By checking the right user's passwords.

D.By just recording information about the typing pattern.

2.Why are there many nanowires on the surfaces of the keys？

A.To keep the keyboard free of damage.

B.To improve the speed of typing.

C.To make the keys smooth.

D.To help produce power.

3.What's Dai's attitude to the new keyboard？

A.Unconcerned. B.Doubtful.

C.Positive. D.Critical.

4.What is the best title for the text？

A.A New Keyboard Made of Nanowires

B.A New Keyboard Entirely Owned by You

C.A New Keyboard's Future

D.A New Keyboard Powered by Typing