A 33-year-old financial analyst in California recently quit his job to devote himself to an unpaid job teaching math on the Internet, and his lessons are reaching almost 100,000 people a month. Salman Khan’s voice is heard every day on the net --- by tens of thousands of students around the world who are hungry for help learning math. He has posted 1,200 lessons on YouTube ... lessons that appear on an electronic blackboard, which range from basic addition to advanced mathematics for science and finance. And they are free.

Khan lives in Silicon Valley, with his wife, a doctor, and their new baby. He got the idea for his “Khan Academy” four years ago, when he taught a young cousin how to convert kilograms to grams. With Khan’s help, the cousin got good at math, and Khan began a new career.

Now, Khan records his lessons himself, but he never goes on camera. “It feels like my voice in their head. You’re looking at it and it feels like someone’s over your shoulder talking in your ear, as opposed to someone at the blackboard, which is distant from you,” he said.

When Springfield High School in Palo Alto, California invited Khan to speak in person --- he immediately connected to the students there.

The idea of short lessons that can be played over and over again attracted high school senior Bridget Meaney. She says she had trouble with math in the seventh grade. “I think the teachers are good, but they can’t teach at a speed that’s perfect for everyone,” she said. “I like the idea of learning something in class but then going back and pressing pause or rewind and actually getting a deeper understanding of it.”

Originally, Khan kept his lessons short because of YouTube restrictions. Now, he thinks short is better. “Education researchers now tell me that 10 minutes is how long someone can have a high level of concentration. And anything beyond that and your brain switches off,” he said.

For Khan, teaching math, science, and finance is just the beginning. He says he’s ready to expand his YouTube site to include other subjects as well.

What gave Khan the idea of teaching math online?

A. His success in helping his cousin learn math.

B. His discovery that many students found learning math difficult.

C. A suggestion made to him at a local high school.

D. His interest in Internet teaching.

Why does Khan never go on camera?

A. He’s too shy to show his face on camera.

B. It’s restricted by YouTube for education videos.

C. He wants to keep distance from the viewers.

D. He wants to create a more relaxed learning atmosphere.

From the passage, we know that ________.

A. Khan travels to many schools to promote his lessons

B. Khan plans to include more subjects in the future

C. Khan gives live math lessons every day for free

D. Khan set up the Khan Academy with his wife

Why does Bridget Meaney like Khan’s lessons?

   A. Khan teaches seventh grade math better than her teacher.

   B. The lessons can be watched repeatedly until fully understood.

   C. She can perfectly follow the pace of Khan’s teaching.

   D. She cannot concentrate when learning in class.

What does Khan mean by “short is better” in the 6^th paragraph?

   A. Keeping the lessons short can ensure better concentration.

   B. YouTube recommends short lessons for its site.

   C. Short lessons encourage students to return to the website.

   D. Students enjoy short mathematics lessons more.

A student went to college after 41__ all his school examinations. There he put his name down for world geography. 42_ after the first day, he did not go to 43_ any more. The teacher noticed that this student was 44_ absent and thought that he had changed to 45 class. He was very 46_ when he saw the boy's name on the list(名单) of students 47_ wanted to take the geography examination 48_ the end of the year.

The teacher had prepared a difficult examination paper, which covered 49 he had taught, and he was eager to see 50 this student answered the questions. He expected that his answers would be very 51_; but when he examined his paper carefully, he found only one small mistake in them. 52_ this surprised him very much, he went through the paper 53_, but was still not able to find 54 one mistake, so he sent 55 the student to question him about his work after the exam..

When the student had 56 the room, the teacher said to him, “I know that you came to my class only once on the first day and that you have been absent from all the others. Yet I have found only one small mistake in your paper. 57_ is that?”

“Oh, I'm sorry about that mistake, sir, ”answered the student. “After the examination, I realized 58 I ought to have written. I would not have made that mistake 59 I had been confused(弄糊涂) by your 60_ lecture.”

1.                A．having         B．taking          C．passing   D．failing

2.                A．So             B．But            C．However  D．And

3.                A．it             B．lesson          C．college   D．class

4.                A．always         B．once           C．never    D．sometimes

5.                A．another        B．the other       C．other D．others

6.                A．angry          B．happy          C．sorry D．surprised

7.                A．that he         B．he             C．who D．whom

8.                A．by             B．at             C．after D．in

9.                A．everything      B．something       C．anything  D．nothing

10.               A．what           B．when          C．how  D．why

11.               A．good          B．full            C．nice  D．bad

12.               A．For            B．As             C．So   D．Though

13.               A．two times       B．twice          C．once D．again once

14.               A．more than      B．another        C．the other  D．second

15.               A．with           B．to             C．x D．for

16.               A．reached to      B．arrived to       C．arrived into D．come into

17.               A．Why           B．What          C．How  D．Which

18.               A．where         B．why           C．what  D．when

19.               A．unless         B．if             C．because   D．as

20.               A．first           B．last            C．latest D．certain

A student went to college(大学) after_41_ all his school examinations. There he put his name down for world geography. _42_after taking the first lecture on the first day, he did not go to class any_43_. The teacher noticed that this student was _44_ absent (缺课) and thought that he had changed to_45__class. He was very_46_when he saw the boy's name on the list(名单) of students __47_ wanted to take the geography examination _48_ the end of the year.

The teacher had prepared a difficult examination paper, which covered__49__he had taught, and he was eager(急切) to see_50__this student answered the questions. He expected that his answer would be very_51__. But when he examined his paper carefully, he found only one small mistake in it.__52__ this surprised him very much, he went through the paper__53__, but was still not able to find__54___one mistake, so he sent__55___the student to ask him about his work..

When the student had__56___the room, the teacher said to him, “I know that you came to my class only once on the first day and that you have been absent from all the others. Yet I have found only one small mistake in your paper.__57___ is that?”

“Oh, I'm sorry about that mistake, sir, ”answered the student. “After the examination, I realized __58___I ought to have written. I would not have made that mistake___59___I had not been confused(弄糊涂) by your ___60___lecture.”

A student went to college(大学) after 36__ all his school examinations. There he put his name down for world geography, 37_ after the first day, he did not go to 38_ any more. The teacher noticed that this student was 39_ absent (缺课) and thought that he had changed to 40 class. He was very 41_ when he saw the boy's name on the list(名单) of students 42_ wanted to take the geography examination 43_ the end of the year.

The teacher had prepared a difficult examination paper, which covered 44 he had taught, and he was eager(急切) to see 45 this student answered the questions. He expected that his answer would be very 46_; but when he examined his paper carefully, he found only one small mistake in them.47_ this surprised him very much, he went through the paper 48_, but was still not able to find 49 one mistake, so he sent 50 the student to question him about his work..

When the student had 51 the room, the teacher said to him, “I know that you came to my class only once on the first day and that you have been absent from all the others. Yet I have found only one small mistake in your paper. 52_ is that?”

“Oh, I'm sorry about that mistake, sir,”answered the student. “After the examination, I realized 53 I ought to have written. I would not have made that mistake 54 I had not been confused(弄糊涂) by your 55_ lecture.”

A 17-year-old boy, caught sending text messages in class, was recently sent to the vice principal's office at Millwood High School in Halifax, Nova Scotia．The vice principal, Steve Gallagher, told the boy he needed to focus on the teacher, not his cellphone．The boy listened politely and nodded, and that's when Mr．Gallagher noticed the student’s fingers moving on his lap．He was texting while being scolded for texting．“It was a subconscious act,” says Mr．Gallagher, who took the phone away．“Young people today are connected socially from the moment they open their eyes in the morning until they close their eyes at night．It’s compulsive．”

A study this year by psychology students at Covenant College in Lookout Mountain, Ga．, found that the more time young people spend on Facebook, the more likely they are to have lower grades and weaker study habits．Heavy Facebook users show signs of being more sociable, but they are also more likely to be anxious, hostile or depressed．（ Doctors, meanwhile, are now blaming addictions to “night texting” for disturbing the sleep patterns of teens．）

Almost a quarter of today’s teens check Facebook more than 10 times a day, according to a 2009 survey by Common Sense Media, a nonprofit group that monitors media’s impact on families．Will these young people get rid of this habit once they enter the work force, or will employers come to see texting and “social-network checking” as accepted parts of the workday? k5u

Think back．When today’s older workers were in their 20s, they might have taken a break on the job to call friends and make after-work plans．In those earlier eras, companies discouraged non-business-related calls, and someone who made personal calls all day risked being fired．It was impossible to imagine the constant back-and-forth texting that defines interactions among young people today．

Educators are also being asked by parents, students and educational strategists to reconsider their rules．“In past generations, students got in trouble for passing notes in class．Now students are adept（熟练的） at texting with their phones still in their pockets,” says 40-year-old Mr．Gallagher, the vice principal, “and they’re able to communicate with someone one floor down and three rows over．Students are just fundamentally different today．They will take suspensions rather than give up their phones．” .

1．The underlined word “a subconscious act” refers to an act __________．

A．on purpose              B．without realization        

C．in secret                   D．with care

2．Young people addicted to the use of Facebook _________．

A．are good at dealing with the social relationships and concentrate on their study

B．have high spirits and positive attitudes towards their life and work

C．have been influenced mentally in the aspects of behaviors and habits

D．are always in bad mood and have poor performance in every aspect

3．Through the situation of today’s older workers in their 20s, it can be inferred that ___．

A．the employers will accept young people’s sending text messages

B．a cellphone is a must for today’s older workers instead of young people

C．the employers prefer older workers to young people

D．the employers will find it hard to control the interaction among young people

4．Mr．Gallagher reminds us that the students in the past and those today _________．

A．like to break rules and have the same means of sending messages

B．are always the big problem for the educators and their parents

C．like sending text messages but those today do it in a more secret and skillful way

D．cannot live without a cellphone

5．What’s the best title of the passage?

A．Teenagers and Cellphones         B．Teenagers’ Texting Addiction

C．Employers and Teenagers          D．Teenagers’ Education