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补全短文

At least one out of every five elementary school students in the US has trouble learning to read， even when the students are good at other subjects. ________.

A.Many adults are interested in matching sounds with letters.

B.The students also practiced reading aloud and spelling.

C.In lower level readers， this structure remains inactive.

D.The biggest challenge for many of these kids， scientists say， is matching sounds with letters.

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