在研究凸透镜成像的实验中，点燃蜡烛后，无论怎样移动光屏，在光屏上都不能形成蜡烛的像，其原因是蜡烛放在了凸透镜的（   ）

阅读下列短文，从每小题的三个选项中选出最佳选项。

     Hello, I'm Linda. I have a garden. There are some plants and flowers in my garden. I like smelling flowers in it. Look at this small plant. It's a gift from my grandmother. It's for Children's Day. I like it very much. It is small and short. It has two small leaves. I water it every day. The plant grows and grows. Now it is big. It has more(更多) leaves. Now it has three pink flowers. They are beautiful. I like these beautiful flowers very much.

设F₁，F₂是双曲线$x^2-\frac{y^2}{24}=1$的两个焦点，P是双曲线上的一点，且3|PF₁|=4|PF₂|，则△PF₁F₂的面积等于（　　）

阅读下面的资料，根据情境要求答题。
“美林”每瓶10毫升，是一种较为安全有效的小儿退热药，下表是该药说明书的一部分。
12岁以下小儿用量表
【用法】                        【口服用量】