考博考试

【单选题】 In Paragraph 3, the word "spikes" (in boldface) probably refers to ______.
A．the increase above the smog standard
B．the irregular readings about air quality in some areas
C．the occurrences of smog in Los Angeles
D．the current standards demanded by ALA

网考网参考答案：A
网考网解析：
第三段一开始说some areas still occasionally exceed the federal standard for ozone，接着就说such spikes…可知spikes指具体超过烟雾标准的情况。所以A是正确答案。 查看试题解析出处>>