单选题：根据以下材料，回答题。"Spider"and"bird"mentioned in paragraph 1 are exa

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题目内容：

根据以下材料，回答题。

"Spider"and"bird"mentioned in paragraph 1 are examples to illustrate
A．animals are people's friends.
B．there are numerous living species on Earth.
C．it is easy to see spiders and birds.　　
D．there are many types of spiders and birds.

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根据以下材料，回答题。请在(46)处填上最佳答案。

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