Because she had ADHD.
題意:
為什么塔尼斯不能一次認真學(xué)習(xí)一個多小時呢?
細節(jié)理解題。根據(jù)第二段,第二、三句The fact was that I was found to have ADHD(注意力缺陷多動障礙). I felt worried all the time and I was unable to study carefully for more than an hour at a
time.事實是,我被發(fā)現(xiàn)患有多動癥。我一直很擔(dān)心,我不能認真學(xué)習(xí)超過一個小時??芍?,塔尼斯不能一次認真學(xué)習(xí)一個多小時的原因是她患有多動癥。故答B(yǎng)ecause she had ADHD.