Most air pollution is caused by the burning of _________ like coal, gas and oil.

A．fuels

B．articles

C．goods

D．products

肯定梨状肌综合征的诊断时最有帮助的检查是（）

A.骨盆CT扫描

B.骨盆MRI

C.有症状下肢的EMG

D.经直肠触及肿大的梨状肌

E.肌肉活检