[单项选择]

Like the body, the memory improves with use. Unlike the body, the memory can improve with age.
For many years, doctors have been studying the way the brain works. We all know that the brain has two sides, the left and the right. The right side controls the senses (seeing, hearing, feeling, tasting and smelling), and is the creative and imaginative side. The left side of the brain controls our logical thinking. It processes the information which comes in, and puts it into order. We call the left side the "educated" side of the brain and generally, in western societies, people have developed this side of the brain more than the right side.
Scientists believe that our brain will work much more efficiently if both the right side and the left side are developed equally. In many schools today, teachers try to educate the children in such a way that both sides of the brain are used. This can be done with logical subjects including mathematics and science as wel
A. their brains could not function efficiently any more
B. the full development of both sides of their brain was achieved
C. their bodies stopped working
D. they were very old