钢筋混凝土预制桩堆放时应设垫木，各层垫木应上下对齐，堆放层数不宜超过( )。

A．3层

B．4层

C．5层

D．6层

I can still recognize Mr. Johnson, who is standing by the door, even though he looks     ___different now.

A．mostly

B．slightly

C．unlikely

D．finally