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【单选题】
“纳米材料”是粒子直径为1～100nm（纳米）的材料，纳米碳就是其中的一种．若将纳米碳均匀地分散到某分散剂中形成均一较稳定的体系，所形成的物质（ ） ①是溶液 ②是胶体 ③能产生丁达尔效应 ④能透过滤纸 ⑤不能透过滤纸 ⑥静置后，会析出黑色沉淀．A.
①④⑥
B.
②③④
C.
②③⑤
D.
①③④⑥
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举一反三
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【简答题】Lanny had sent his mother a telegram upon his (arrive) ______ in Brest.
【单选题】What is the man' s problem?
A.
He has missed his flight．
B.
His flight will arrive late．
C.
He has to take another flight．
D.
His flight has been cancelled．
【简答题】His (arrive) made the situation worse.
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