专四专八考试

【单选题】{{I}} Questions 17 to 20 are based on the following passage.At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage.{{/I}} Which of the following is NOT among the types of the pollutants the author mentions in the passage
A、Sulfur oxides.
B．Toxic materials.
C．Particulate matter.
D．Carbon monoxide.

网考网参考答案：B
网考网解析：
如果仔细听短文中的陈述，第一类、第二类和第三类污染物时，就会发现选项B不属于里面的任何一类，而是第一类污染物所带来的有害物质。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>