对于绝热结构的基本要求有( )。

A．保证热损失不超过标准热损失

B．绝热结构应有足够的机械强度

C．绝热结构不宜简单，材料消耗量越多越好

D．绝热结构表面应整齐美观

The officials soon realized that, _________, things would get worse.

A．unless dealt with it properly

B．if not properly dealing with

C．unless properly dealt with

D．if dealt not properly with