题目内容：
请在（4）处填写正确答案。
A．Many adults are interested in matching sounds with letters. B．The students also practiced reading aloud and spelling.
C．The biggest challenge for many of these kids, scientists say，is matching sounds with letters.
D．Another group in the study who went through a more traditional reading program didn't show the same progress.
E．The pictures showed all increase in activity in the back of the brain on the left side.
F．They believe that reading without making any noise or linking words to sounds is more efficient.
参考答案：
答案解析：