阅读上面的材料，选择正确答案。

Most children like to visit Disneyland. But do you know these secret（秘密的）things?

The Cats

It's not easy to keep the park clean. Every night after the closing time, about 200 cats will come into the park. Because of them, there are few pests (害虫) in the park. They are the nice workers in the park.

The Light

In the 1950s, Walt Disney has an apartment in the park. When the light in the house was on, people would know that the owner of the park was in. Today, the light always stays on in honor of (为了表示对......的崇敬) him.

The Hidden Mickeys

At Disneyland, Mickey Mouse logos (标志) are everywhere. However, there are hundreds of "Hidden Mickeys" in the park. They are often difficult to find. No one knows how many "Hidden Mickeys" there are in the park.