— I find it astonishing that John ________ be so rude to me.

— In fact, he is always rude to others.[ ]

A. should  

B. must

C. might  

D. ought to

下列均是脊髓灰质炎瘫痪前期的体征，但应除外的是（）

A.三脚架征阳性

B.腱反射消失

C.克氏征阳性

D.头下垂征阳性

E.胸膝试验阳性