提供三种适合于初学者的英语阅读文章及其对应的问题。
1. "The Cat in the Hat" by Dr. Seuss
   Question: Who are the main characters in "The Cat in the Hat"?

2. "The Giving Tree" by Shel Silverstein
   Question: What is the story about in "The Giving Tree"?

3. "Charlotte's Web" by E.B. White 
   Question: What kind of animal is Charlotte in "Charlotte's Web"?