可以区别脊髓压迫症和肌萎缩侧索硬化的体征是（）。

A.传导束型感觉障碍

B.下肢的肌张力升高

C.手部肌肉萎缩无力

D.两下肢病理征阳性

E.下肢的腱反射亢进

A conscious victim who has suffered a blow to the head has symptoms that indicate the possibility of concussion. If the patient feels no indication of neck or spine injury，recommended treatment would include（）.

A.turning the victim's head to the side to keep his airway open

B.positioning the victim so the head is lower than the body

C.giving the victim water if he is thirsty，but no food

D.elevating the head and shoulders slightly with a pillow