2. 外语
  3. What can we infer from the tragic example given in the first paragraph? After 1957 the pollution of the Thames began to reduce

What can we infer from the tragic example given in the first paragraph? After 1957 the pollution of the Thames began to reduce

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问题 What can we infer from the tragic example given in the first paragraph?
After 1957 the pollution of the Thames began to reduce quickly because ______.
选项 A、manufacturers agreed to produce biodegradable detergents instead of non-biodegradable detergents
B、river authorities cooperated very well with government representatives
C、ways had been found to degrade the new "hard" detergents
D、more sewage works had been built to treat polluted water
答案A
解析 细节题。参见文章第三段第二句：．．．agreed to phase out．．．(通过友好劝说，生产商同意逐步淘汰“硬”清洁剂，以支持可分解型清洁剂的生产。)
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大学英语四级

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