—Here the photos you want.
—Thank you ! [ ]
A. is
B. was
C. are
D. were
答案:C
多发性硬化是一种
A.神经系统变性病
B.维生素B12缺乏病
C.周围神经脱髓鞘疾病
D.中枢神经系统脱髓鞘疾病
E.中枢神经系统真菌感染
成人食管颈段的长度一般是
A.3cm
B.4cm
C.5cm
D.6cm
E.7cm