题目内容：

A great invention by an 18-year-old high school student grew out of a simple problem most teenagers meet with.

“I'm a teenager and I have a cellphone and my cellphone battery always dies，so I was really looking for a way to improve energy storage，” Eesha Khare said on Tuesday. “That's how I came across the super capacitor.”

The teenager who came from California, and graduated from high school last week，won a $50，000 prize on May 17，2013 at the Intel International Science and Engineering Fair for creating a device that can store enough energy to charge a cellphone in 20 to 30 seconds.

“It charges very quickly and can store a lot of energy，” Khare said. “The cool thing is that it's a lot thinner than one strand of hair.”

Khare hasn't used her invention to recharge a cellphone yet，but she used it to power a light-emitting diode (LED) in order to show its capability(容量). If used on cellphones，the supercharger would slide on to the phone's battery to juice it up in a matter of seconds. The technology isn't available to consumers yet，and it could be years until it is.

At an Intel event in Phoenix，Khare won the Intel Foundation Young Scientist Award，taking second place overall in the world's largest high school science research competition. She beat out more than 1，600 finalists from 70 countries. She said that she has been approached by several companies to continue her research，but she is now focused on attending Harvard University in autumn.

“Right now，just my education，but hopefully we'll see what happens in the future，” she said about her plans. “I have a lot of interests，so we'll see what I do in the future.”

1.The passage starts with ________．

A. what problem most teenagers meet with in life

B. how Khare helped others with their problems

C. why Khare decided to make the invention

D. how teenagers make use of their cellphones

2.According to the passage, Khare ________．

A. was most probably born in 1995

B. will graduate from high school

C. will donate much of her prize

D. is the first teenager to win such a big prize

3.The super capacitor ________．

A. is as thin as a hair

B. can produce enough energy soon

C. has been popular on the market

D. has not been put in use in daily life