【单选题】Section D Learning disabilities are very common. They affect perhaps 10 percent of all children. Four times as many boys as girls have learning disabilities. Since about 1970, new research has helped ...
A.
an early expert on learning disabilities
B.
Scientists now know there are many different kinds of learning disabilities
C.
So the brain was like an electrical device in which the wires were crossed.
D.
So some researchers began looking at the brain itself to learn what might be wrong.
E.
Scientists found that the brain cells of a learning-disability person differ from those of a normal person in size and arrangement.
F.
The differences appeared throughout the brain.
G.
they measured the brain's electrical activity
H.
One involved cells in the left side of the brain (67)