骶骨由5块骶骨()而成。
A、结合
B、联合
C、融合
参考答案:C
The lady walked around the shops, _____ an eye out for bargains. [ ]
A. keep
B. kept
C. keeping
D. to keep
评估战略的成功标准有( )。
A.可行性标准
B.可接受标准
C.适宜性标准
D.可理解性标准