第10题: [单项选择]Questions 19 to 21 are based on the passage you have just heard. A. Animals were hurt by the black snow. B. Pollutants are dangerous to people and animals. C. A black snow of harmful pollutants fell on a town in Sweden. D. Natural cycles of wildlife. 参考答案:C 答案解析:[解析] 19-21 On December 25, 1969, a black snow covered the shores of Lake Veteran. in S