其它
\textbf{According to a report for veterinarians in the United States, 36.5 percent of households in the United States own dogs and 30.4 percent of households in the United States own cats. If one household in the United States is selected at random, what is the probability that the selected household will own a dog or a cat?} 
Overseas Competition->Knowledge Point->Calculation Modules
\textbf{The sample in the report is about veterinarians. The population cannot be a household in the United States.} 