单选题 It is common that American children ______。

【正确答案】 A
【答案解析】细节题。最后一段的第三句提到“And foreigners are often appalled at the behavior of children,who commonly are disruptive in public and feel free to speak to their parents in a manner unheard of in many cultures.”原句中的disruptive意为“捣乱的”,用英文改述即make troubles (制造麻烦,捣乱)。所以应该选A。