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托福词汇440题(195):detectable

2014-05-19 08:50:00来源:新东方在线整理

  托福词汇440题第195题

  The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0. 08 parts per million (ppm) , which is about 400 times its natural level.

  The word "detectable" is closest in meaning to which of following?

  (A) beneficial

  (B) special

  (C) measurable

  (D) separable

  答案见第2页

  

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