A sharp sword was found buried together with the royal carpenter, which was believed _____himself

  against grave robbers.    [ ]

A. used to defend  

B. being used to defend  

C. to be used to defending  

D. to be used to defend

伤寒发病两周，微生物学检查分离培养时常采取的标本是（）

A.骨髓

B.血液

C.尿

D.便

E.十二指肠液