单选题____AquestionBcrisisCphenomenonDsituation

单选题
____
A

question

B

crisis

C

phenomenon

D

situation


参考解析

解析:
question问题;难题。crisis危机;难关。phenomenon现象;征兆。situation形势;状况。这句话的意思大是说:赤潮是一个全球性的……。因为赤潮是一种自然现象,本文解释了它形成的原因,所以正确答案为C。

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