As facts prove,a mother sits in the passenger seat while a teen learns to drive,which can change the teen's brain activity.For the study,researchers came up with a driving simulation（模拟）test that encourages risk-taking behavior in teens.
Twenty-five teens were asked to pass the simulation test in the shortest time possible.In the simulation,there are 26 intersections（交叉路口）that teens need to pass through.Each intersection provides a choice to stop at a yellow light,which could delay（耽搁）the driver for three seconds,or finish the simulation faster by speeding through the yellow light.
If the drivers didn't crash,they'll finish earlier;if not,there is a six-second delay to their time of completion（完成，结束）.The study required（要求）teens to go through the simulation on their own as well as under Mum's watch.
The results show that when teens drive alone,they drive past the yellow light 55 percent of the time.However,if Mum is present,racing past the yellow light was seen at decreased rate of 45 percent.In addition,the study found that driving alone caused changes in the teens' brains,causing an increase of blood flow towards the reward center of the brain.If Mums were present,blood flow to the brain's reward center increased when they make safer driving decisions.
Researchers think that parents play an important role in helping their children to make more thoughtful decisions.Sarah Helfinstein,a researcher From University of Maryland,who's in the passenger seat,"Basically,they're being influenced by what they expect the wish of the other person to be,"she said.
27.What were the teens asked to do in the driving simulation test?
A.To stop at the yellow light. B.To finish the test as quickly as possible.
C.To make as few mistakes as possible. D.To go through the intersection safely.
28.What happened to the teens when they were driving alone?
A.They completed the test 6 seconds early. B.Their brain's reward center became less active.
C.More blood flowed towards their brain's reward center. D.They were less likely to race past the yellow lights.
29.From the last paragraph,we know that Sarah Helfinstein .
A.gives further explanation to the study B.adds new evidence to the study
C.offers a different opinion on the study D.expresses her doubts about the result of the study
30.What can we learn from the driving simulation test?
A.Teens shouldn't drive alone. B.Teens learn to drive quickly with Mum.
C.Teens are influenced by Mum's driving style. D.Teens drive more safely with Mum in a car.
BCAD
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