在数列 $\left\{a_n\right\}$ 中， $a_1=1,a_{n+1}=\left(1+\frac{1}{n}\right)a_n+\frac{n+1}{2^n}$

（I）设 $b_n=\frac{a_n}{n}$ ，求数列 $\left\{b_n\right\}$ 的通项公式

（II）求数列 $\left\{a_n\right\}$ 的前 $n$ 项和 $S_n$

据有关部门统计，2018年“五一小长假”期间，广东各大景点共接待游客约14420000人次，将数14420000用科学记数法表示为（   ）

根据短文内容理解，选择正确答案。    Hi, I'm Brian. This is the photo of my family. My grandfather is with glasses. He has little hair. The one standing next to him is my uncle. He is wearing a cap. My grandmother has gray hair. She is a kind woman. She is holding my younger brother. He has short curly hair. The woman standing behind me is my mom. She has straight brown hair. There is a little girl sitting on the table. Her name is Cathy. She is my sister. She is wearing a green T-shirt and a pair of green socks. It's her favorite color. Which one is my father? Well, he is wearing glasses, too. He is in brown shorts and brown shoes. His name is Sam. Now, do you know where he is?

世界最大的大洲和大洋分别是（   ）

已知函数f（x）=asin（πx+α）+bcos（πx+β），且f（2002）=3，则f（2003）的值是（   ）