以下哪项不属于矿井甲烷的危害。（）
A、可以导致爆炸
B、可以导致人员窒息
C、可以导致煤与瓦斯突出
D、可以使人中毒
参考答案：D
原发性肝癌淋巴转移主要累及（）
A.肝门淋巴结
B.胰周淋巴结
C.腹膜后淋巴结
D.主动脉旁淋巴结
E.胃左淋巴结
It doesn't seem ugly to me. ________,I think it's rather beautiful. [ ]
A. On the contrary
B. In a word
C. On the other hand
D. On one condition
