题目

根据汉语提示填写合适的单词（1）Chen Gang and Chen Hai are my (表弟).（2）Mr. Smith's （女儿）are in Beijing.（3）—Are Emma's （叔叔）English?—No, they are Chinese.（4）His three （儿子）are not at Brown School.（5）Look at this （图画）. 答案：【1】cousins【2】daughters【3】uncles【4】sons【5】picture若（1012+25）2-（1012-25）2=10n，则n=（    ）。