If you have read the fairytale about the Italian boy Pinocchio, you will remember that every one knew when he lied because his nose grew．But did you know that your brain can also betray(出卖)you when you tell a lie?
A study released last Monday showed that the brains of people who are lying look very different from those who are telling the truth．According to the US researchers, this finding could lead to creating a more accurate lie detector(测谎仪)．
“There may be separate areas in the brain involved in truth-telling and cheating that can be measured,” said Scott Faro, head of the research group．
Faro and other scientists tested nine volunteers．Six of them were asked to shoot a toy gun and then lie and say they didn't do it．Three others who watched told the truth about what happened．
The volunteers were connected to a special machine, which used a strong magnet(磁铁)to provide a real-time picture of brain activity．Clear differences were seen between the liars and the truth-tellers．A total of seven areas were active in the cheating group, but only four in the truth-telling team．
“It seemed to take more brain effort to tell the lie than to tell the truth,” Faro said．
The traditional lie-detector machine looks at sweat, skin, breathing and heart rate changes．
Using such new technology as a lie detector would be expensive, but it might be worthwhile in some criminal cases．
(1)
At the beginning of the story, the author mentioned Pinocchio in order to ________．
[ ]
A．
introduce something funny about lying
B．
tell you that now in real life liars can be recognized
C．
inform you that criminals can no longer lie without being found out
D．
introduce you to a discovery that another part of your body can give a liar away
(2)
What did Faro and other scientists find?
[ ]
A．
Cheating and truth-telling involve totally different brain areas．
B．
More volunteers are needed to make sure that their technology is reliable．
C．
The differences in brain activities can show whether a person has told a lie．
D．
Telling the truth is much easier than telling a lie．
(3)
Which is the biggest disadvantage of the prospective(预期的)lie-detector?
[ ]
A．
It could only be used in criminal cases．
B．
Its cost would be very high．
C．
Compared to the traditional lie-detector, it still needs perfecting．
D．
Differences can be shown only in brain activities．
(4)
The main purpose of writing this story is to ________．
[ ]
A．
inform us that a new research suggests a new lie-detector is on the way
