( )4. Why is it easier to remember things in our childhood?
a. They were special. b. We got strong feelings from them.
c. They were helpful. d. We heard them many times.
A. ad B. bd C. ac D. bc
B
( )5. Which is the CORRECT picture for Hermann Ebbinghaus's forgetting curve?

C
( )6. What can we learn from the last paragraph?
A. A person has his or her best memory at the age of 25.
B. A fifteen-year-old's memory is worse than a middle-aged man's.
C. A person's memory gets worse only because the brain gets smaller.
D. A child usually remembers over 12,000 pieces of information in a minute.
A
( )7. How is the passage organized?
A. ①/②③/④ B. ①/②/③④ C. ①②③/④ D. ①/②③④
A