已知集合$A=\left\{x\right|y=\sqrt{{\log }_{2}x}\},B=\{y|y={\left(\frac{1}{2}\right)}^x,x>0\}$，则$A\cap C_{R}B=$(     )

下列多项式相乘，不能用平方差公式计算的是（　　）

任务型阅读   

My name is Scott．I am an American boy．I am thirteen years old，Now I am a student in Great School in Dalian，Liaoning．I am in Class One，Grade Seven．I like sports．My favourite sport is table tennis．But I can 't swim．My mother is a music teacher．

She can sing and dance．can the，play，she，piano(?)Yes，she can．My father is a hotel manager．He can speak Chinese，English，Japanese and Russian．He is popular in the hotel．

根据短文内容，完成下列各题。   

______of the boys has got a pen and some paper.