问题详情

In Paragraph 3, the word "spikes" (in boldface) probably refers to ______.
A．the increases 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此题为多项选择题。请帮忙给出正确答案和分析，谢谢！