Did you ever wonder why you have no memory of when you were a baby or very young child?The question

Did you ever wonder why you have no memory of when you were a baby or very young child?The question of why adults do not remember how they learned to walk or talk has long been a mystery.Researchers at Temple University in Philadelphia,Pennsylvania in the United States are looking into this question.
The study contained computer-based tests.The tests were designed to work like games.They were given to 32 four-year-olds,32 six-year-olds and 50 young adults.The tests measured the memory process that helps people recognize differences between experiences.For example:A walk with your dog when you saw a friend,and a different walk without your dog or when you did not see your friend.
The second test was showing the children and young adults taking the test a number of photographs.They were asked to compare the first group of photos with a second set of pictures.Sometimes,the two sets of photos were the same.But other times,they were different.
The results showed that in both tests,six-year-olds showed far better memory than four-year-olds.That might help explain why adults do not remember when they learned to walk or talk,but they do remember their third,fourth or fifth birthdays.
“We don’t have any memories in the first two years of life,and all of a sudden we’re able to form these memories for something going on in early childhood or middle childhood.That’s very interesting,”said Zoe Ngo.
Researchers said doing some research on the memory is of great value as doctors are trying to develop a cure for Alzheimer’s disease.People with the disease suffer memory loss.For some people,memory loss is just for recent events.People may not remember what they did that morning,but remember experiences from 50 years ago.But memory loss research is not limited to helping patients with Alzheimer’s disease.It could also help find ways to get better and more reliable information about how to improve people’s memory.
9. What do the researchers draw their attention to?
A. Why people fail to complete simple tasks.
B. Why people cannot recall their first few years of life.
C. Why people find it hard to learn special memory skills.
D. Why people have trouble forgetting past painful experiences.
10. What is the purpose of the second test?
A. To check how people remember differences in objects.
B. To explain why people have better memory than before.
C. To prove when people show interest in beautiful pictures.
D. To show where people would like to take different photos.
11. What can we infer from what Zoe Ngo said?
A. People are willing to share good old days.
B. People are likely to remember past special events.
C. People are afraid of getting unexpected bad results.
D. People are more concerned about their happy childhood.
12. What does the last paragraph mainly discuss?
A. The way to deal with memory loss.
B. The importance of memory research.
C. The possibility of collecting information.
D. The measures to prevent Alzheimer’s disease.
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