John is the tallest boy in the class, _______ according to himself. [       ]

A. five foot eight as tall as

B. as tall as five foot eight

C. as five foot eight tall as

D. as tall five foot eight as

当混凝土强度评定不符合《混凝土强度检验评定标准》要求时，回弹法、钻芯取样法、后装拔出法检测的混凝土强度推定值（）作为结构是否需要处理的依据。

A.可

B.宜

C.不能

D.禁止