— Where _____ the country CDs?    

— They _____ behind the classical CDs.  [ ]

A. is, is

B. are, is

C. is, are

D. are, are

下列不应选用青霉素G的情况是（）

A.梅毒

B.伤寒

C.鼠咬热

D.气性坏疽

E.钩端螺旋体病