题目内容：

A new keyboard can tell whether you are its owner. The keyboard records information about the typing pattern 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 anyone else, even if the person knows password. What’s more, this device needs no batteries. It harvests all the energy it needs from the action of your 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 to every key, increasing the effective contact area between the plastics and fingers. This ensures 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 devices. “It could also be applied to a touch screen, for instance,” Dai says. “Then smart phones and notepads could harvest energy from the action of someone typing or drawing.”

“Future work might make the keyboard even more useful,” Dai adds. “A later design might build tiny capacitors（电容器）onto the nanowires,” he suggests. Capacitors are little devices that temporarily store electric charges. Those might then 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（投资）its production, this keyboard could be in stores in as little 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 recording information about the typing pattern.

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

A. To increase the effective contact area.

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