Bill Gates and the president of General Motors have met for lunch，and Bill is going on and on about computer technology．"If automotive technology had kept pace with computer technology over the past few decades，you would now be driving a V32instead of a V8，and it would have a top speed of 10，000miles per hour，"says Gates．"Or，you could have an economy car that weighs 30pounds and gets a thousand miles to a gallon of gas．In either case，the sticker price of a new car would be less than $50．Why haven't you guys kept up？"
The president of GM smiles and says，"Because the federal government won't let us build cars that crash four times a day．"
Why is that funny （or not funny，as the case may be）？Human beings love to laugh，and the average adult laughs 17times a day．Humans love to laugh so much that there are actually industries built around laughter．Jokes， sitcoms and comedians are all designed to get us laughing，because laughing feels good．For us it seems so natural，but the funny thing is that humans are one of the only species that laughs．Laughter is actually a complex response that involves many of the same skills used in solving problems．
Laughter is a great thing-that's why we've all heard the saying，"Laughter is the best medicine．"There is strong evidence that laughter can actually improve health and help fight disease．In this article，we'll look at laughter-what it is，what happens in our brains when we laugh，what makes us laugh and how it can make us healthier and happier．You'll also learn that there's a tremendous amount that no one understands yet．

(1) What's the best title of the passage？ ______

A. Laughter

B. The joke between Gates and the president of General Motors

C. Why do we laugh？

D. Laughter and health

(2) Which one is NOT true according to the passage？ ______

A. Computer technology has developed quickly during the past few decades．

B. Automotive technology has developed as fast as computer technology according to Bill Gates．

C. The president of GM thinks it is impossible to build cars worth less than 50dollars．

D. If cars were less than 50 dollars，a large number of accidents would happen per day．

(3) From the passage we can know that ______ ．

A. humans laugh because it can fight disease

B. humans have gained skills to laugh since they are born

C. humans are one of the only species that can laugh

D. laughing can make humans feel bad

(4) The underlined word"sitcoms"in Paragraph 3 means" ______ "．

A. situation comedies	B. tragedies
C. body languages	D. fictions．

(5) This passage is most probably an ______ ．

A. introduction of an article about Microsoft

B. introduction of an article about laughter

C. article about laughter

D. introduction of an article about General Motors．