对虾的排泄器官随发育而变化,幼体时以()进行排泄,到成体时则由()取而代之。
参考答案:颚腺;触角腺
The shopkeeper did not want to sell for ______ he thought was not enough.
A.where
B.how
C.what
D.which
首先采用悬吊整复治疗脊柱骨折的医生是()
A.晋代的葛洪
B.隋代的巢元方
C.明代的薛己
D.元代的危亦林
E.唐代的蔺道人