实木地板应( )。
A．防蛀 B．防火 C．防潮 D．防水
参考答案：A
They will do () they can to overcome () great difficulties there may be.
A．that; whatever
B．what; whatever
C．what; which
D．which; what
贮煤场容量取决于（）.
A.煤种
B.焦炉生产能力
C.煤的质量
D.贮存天数
