铺设地毯的基层即楼地面面层，底层地面的基层应做（）处理。
A.找平
B.防潮
C.找毛
D.加固
参考答案：B
3，2，11，14，( )
A．27
B．36
C．49
D．64
People stood around in small huddles, _____ the rain. [ ]
A. preventing from
B. sheltering from
C. stopping from
D. keeping from
