[originaltext] [5]PCBs, were manufactured from the 1920s, but were banned in

游客2024-01-23  15

问题  
[5]PCBs, were manufactured from the 1920s, but were banned in the US in 1979, in the UK in 1981 and in the rest of the EU in 1987.
    [6]They were found to have a wide-ranging impact on human and animal health, from links to cancer, to restraining the immune system and causing reproductive problems. However, these chemicals are extremely durable and despite the ban they are still found in the environment.
    "Europe produced about 300,000 tonnes of PCBs from 1954 to 1984. That was about 15% of the world’s total," said Dr Jepson. "A lot of this PCB, we don’t know how much, has not been dealt with and is slowly leaking into rivers, from landfills, and eventually into the marine environment." The chemicals then gradually work their way up the food chain and into the top marine animals.
    The researchers analysed samples taken from more than 1,000 killer whales and dolphins in Europe’s waters. "Our findings show that, despite the ban and initial decline in environmental pollution, [7]PCBs still persist at dangerously high levels in European whales," explained Dr Jepson.
5. When were the PCBs banned in the UK?
6. Why should PCBs be banned according to the news report?
7. What do we learn about PCBs from the research?

选项 A、There aren’t any PCBs in Europe’s waters.
B、1,000 killer whales and dolphins carry PCBs.
C、There is no relation between PCBs and environment.
D、PCBs still exist in European whales.

答案 D

解析 新闻的最后提到,杰普森博士解释说其研究结果显示PCB仍然存在于欧洲的鲸类中。故D正确。新闻中提到有很多PCB流入河流和河口,最终流入了海洋环境,故A“欧洲的水体没有PCB”与新闻不符。研究人员分析了欧洲海域的1000多个虎鲸和海豚的样本,并不表示有1000条虎鲸和海豚携带了PCB,故B错误。整篇新闻都涉及了PCB和环境污染的联系,故C不对。
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