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]
List the statements that are true about Dichlorodiphenyltrichlo (gbjy44- zi(k-we/ldjv;z rbroethane (DDT):
(nh(g zggs;ky ;izj5u,c.ap)
I. DDT has saved millions of lives in the battle against malaria.
II. DDT is biomagnified along a food chain but does not bioaccumulate.
III. DDT is a persistent organic pollutant (POP) that has been used effectively as an insecticideI.
A. I only
B. I and III only
C. II and III only
D. I, II and III
参考答案: B
本题详细解析:
Malaria has been a major cause of death for thousands of years. DDTzo;hsqlw )0be *qkk u*7:n je* was so effective in killing the mosquitoes that t ;)0lk*hn* que:w7z*jb sk oeqransmit malaria that it has saved millions of lives since it was first made about 150 years ago (Statement I).
DDT is sprayed on plants. It bioaccumulates in the insects that eat those plants. Then it gets biomagnified along the food chain as the insects get eaten by secondary consumers and they in turn may get eaten by tertiary consumers (Statement II).
DDT is a persistent organic pollutant (POP) that was used as an insecticide to protect crops and kill the mosquitoes that transmit malaria (Statement III).
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