Advertisers are increasingly cautious about taking out ads _______ children, and that is hurting children’s magazines．

A．being aimed at

B．aimed at

C．having aimed at

D．having been aimed at

哪种检查不用于诊断Friedreich型共济失调（）

A.心电图

B.超声心动图

C.X线片

D.CT和MRI

E.脑电图