（）本身不燃烧，当它与空气混合到一定浓度后遇火就能燃烧或爆炸。
A、二氧化碳
B、瓦斯
C、煤尘
D、氮气
参考答案：B
对于（）而言，实质性重要事实是指那些会影响其作出投保决定的事实，如有关保险条款、费率以及其他条件等。
A.保险人
B.投保人
C.受益人
D.被保险人
— You promised to come to my dinner party last night but you didn't turn up.
— I _____, but something unexpected happened just before I left. [ ]
A. would like to have
B. should like to
C. am going to
D. like to
