正氮平衡就是为新增或修复组织的需要,有一部分氮将
A.在体内消耗掉
B.在体内储留
C.被机体吸收
D.被机体利用
E.以上都不是
参考答案:B
Shelly had prepared carefully for her driving test so that she could pass it at her first______. [ ]
A. attempt
B. intention
C. desire
D. purpose
简述北京茶馆的类型与特点。