Karma İngilizce Soruları 4 48. Soru

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48.

We learn from the passage that scientists……….. .

know that stuttering is genetic, but haven't found the gene that causes it

doing research into stuttering generally agree with public opinion

have not yet been able to determine exactly what causes stuttering

have discovered that both genetics and psychology cause stuttering

feel that stuttering is caused by emotional problems but can't prove this