通读全文，根据对短文的理解，选择正确的答案填空。    

    My name is Tony. I'm1  English boy. I'm twelve years old. I'm a  2 . Jim is my good friend. He3 from the USA. We are in 4  class. He's twelve years old,  5 . I have a nice  6 . Now, look  7  my photo. Jim has a long face, small eyes, brown and short hair. And the boy in a yellow cap is me. Yellow is my favourite 8 . Jim has a  9 . Her name is Kate. She is ten years old. Kate has a round face and  10 eyes. They look different.

①铁钉表面产生气泡；

②溶液由无色逐渐变为浅绿色；

③铁钉质量减轻；

④溶液质量减 轻。

其中正确的是(    )

等比数列$\left\{a_n\right\}$中，已知$a_9=-2$，则此数列前17项之积为（   ）