矿井五大自然灾害不包括（）。
A、水
B、火
C、瓦斯
D、跑车
参考答案：D
Is that the reason ________he explained to all at the meeting for his carelessness in his work? Actually we think he is a man who is hard ________ himself especially in work.
A．that; on
B．what; with
C．why; at
D．which; to
纯羊毛纱线织造的凡立丁织物(170g/m2；幅宽180cm) ( )
A．11
B．12
C．7
D．9
