“纳米材料”是当今材料科学研究的前沿，其研究成果广泛应用于催化及军事科学中。“纳米材料”是指研究、开发出的直径从几纳米至几十纳米的材料。如将“纳米材料”分散到液体分散剂中，所得混合物可能具有的性质是

A．所得分散系不稳定

B．能全部透过半透膜

C．不能透过滤纸

D．有丁达尔效应

Totally ________, both of the world famous writers were born and died on the same day and of the same disease.

A．by coincidence

B．by incident

C．by accident

D．by luck