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水体污染是指大量的污染物排入水体，水体及周围的生态平衡遭到破坏．水体污染的主要来源有工业污染、______、______．自然界的水所处环境不同，往往含有不同的杂质，欲使其转化为纯净水，需要运用适当的净水方法，以下是一些常用的净水方法，请选取合适的序号填空． ①利用活性炭吸附；②利用静置或加絮凝剂的方法进行沉淀；③过滤；④蒸馏上述方法中，只能除去不溶性杂质的是______，只能能除去有机色素或异味的是______，能除去大多数杂质，并使硬水软化的是______，上述方法按净化程度由低到高排列的顺序是______．
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举一反三
【简答题】The short story “The Open Boat” was written by _________.
【简答题】“The Minister’s Black Veil” is a short story written by __________.
【简答题】Give a definition of 'short story'.
【简答题】“Rappaccini’s Daughter” is a short story written by __________.
【简答题】“Young Goodman Brown” is a short story written by __________.
【多选题】The characteristics of the short story are __________.
A.
The short story allows different interpretations.
B.
The reader of the short story can discern some melancholy poetic quality.
C.
In a short story the author's voice is generally disguised, speaking through a narrator.
D.
The reader of the short story is not a passive receiver of the message, but an active participant.
【简答题】The short story “Daisy Miller” was written by _________.
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