根据语篇情景，用恰当的短语或句子填空，使之意思完整。

     This is my room. There is a desk in it. My books and my notebooks are __1__. My family photo is on

  the desk, too. In the photo, you can see__2__ , my brother and me. My father likes basketball very

  much. We often play sports in the afternoon. I am happy and I love my family very much.

函数y=sin（7x+3）的导数是（）。

A.7cos（7x+3）

B.7sinx

C.7cosx

D.7sin（7x+3）