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单选题
为避免污染，必须在非常清洁的环境里执行该任务。
A
A.Because of the risk of contamination, you must do this task in a very clean environment.
B
B.To prevent environmental pollution, this task must be done in a very clean area.
C
C.In order to prevent contamination, the task you must do is to find a very clean environment.
答案解析
正确答案：A
解析：
该题考察对环境保护意识的理解，正确答案是A，因为句子中提到了避免污染的概念，而B和C选项分别提到了防止环境污染和寻找干净环境，与原句意思不符。
相关知识点：
防污染，清洁环境做任务
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