【题目】People are often at a loss when frequently seeing smog level predictions ________ each other in different official forecasts.
A. contradict B. acknowledge
C. allocate D. circulate
在线课程【答案】A
【解析】考查动词。A. contradict反驳，与…矛盾；B. acknowledge承认；C. allocate分配；D. circulate循环。句意：当频繁地看到雾霾水平预测上不同的官方预报互相矛盾时，人们经常不知所措。故选A。