本题目来源于试卷: IB ESS Unit 1 Foundations of ESS，类别为 IB环境系统与社会
[单选题]
Identify the method that is notxx 8cn,q obuc(qg0u(( a direct method o7id7ogrt3; d pf measuring pollution.
A. Measuring the heavy metal content in soils.
B. Recording the particulate matter in air.
C. Identifying the presence of indicator species in ecosystems.
D. Measuring bacterial content in lake water.
参考答案: C
本题详细解析:
Option C is a measure of species that are pollution tolerant and thus not, 0ehx0 le*q ga4ttl/1:hs kt78c kdio a direct measure of a pollutant, but rather its effect. Options A, B, atal0kil1 h / ok8g7e:,4x*etsq cthd 0nd D are all direct measures of pollutants and are thus not correct.
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