题目

At times my mom has been uncomfortable seeing these qualities in me. For example，when I was 12，I went to Puerto Rico all by myself to stay with my grandmother for the summer. My mom was extremely nervous about it. She kept telling me how things were different in Puerto Rico，to always put on sunscreen（防晒霜），not to wander away from my grandmother，and other warnings. She helped me pack and did not leave the airport until she saw my plane take off.    But despite（尽管） her worries，she let me go on my own. As I moved into my teens，she continued to give me sp如图所示，MN为玻璃和空气的分界面，AO为入射光线，O为射点，在图上画出折射光线的大致位置，并标出折射角（在折射角处标上γ）