Zoology is everything about animals. And people who study it are called zoologists. They want to learn about the difference between different kinds of animals, where they come from, and how they live.

What do zoologists do?

There are many different kinds of zoologists. Some try to learn everything about one animal, and some learn about a group of animals, some try to understand where new kinds of animals come from and other zoologists are interested in how animals can get sick. Many zoologists study what animals do when they are with other animals.

A famous zoologist

Charles Darwin is probably the most famous zoologist. He showed that animals are all one big family and that every kind of animal changes slowly to match the place where they live. This is called "evolution （进化） ". During his life, people laughed at Darwin, saying that people and animals couldn't come from the same family. However, many zoologists today agree that Darwin was right.

Why is it important?

Understanding animals is important because people are animals. When we study animals, we learn about ourselves.

Do you know?

•Frogs can breathe （呼吸） without their mouths! When frogs are not in water, their bodies can take air through their skin.

•Some people say sharks never get sick, but that is not true. Sharks get sick, just like any other animal.

51 ． What kind of people are called zoologists? （根据短文内容回答问题）

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52 ． How many kinds of zoologists are mentioned （提到） in paragraph2? （根据短文内容回答问题）

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53 ． Why is it important to study animals? （根据短文内容回答问题）

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54 ． In the passage, the underlined word "that" refers to （指） "_______"

55 ． Which sentence in paragraph 3 shows people's attitude （态度） towards Darwin when he was alive? （按要求在短文中找到并写出该句） ______________________________