题目

One of every four children in New Mexico and Texas lives in households that struggle to provide enough food at some point during the year, a report says. The report is the first to give a state-by-state look at child hunger.    “It is a real eye-opener to see that so many states have such high rates of child food insecurity (不安全) and hunger,” says author John Cook, an expert on child hunger. He says lack of healthful food can damage a child’s physical and mental development.     Nationwide, the report finds that 13 million children, or 18%, were hungry or at risk of hun计算（2a3b2）2÷ab2 的结果为（ ）A. 2a2 B. 2a5b2 C. 4a2b2 D. 4a5b2