题目选项分析

The 32 species that make up the dolphin family are closely related to whales and in fact include the animal known as the killer whale, growing as big as 30 feet long and famous for its aggressive hunting pods.

The 32 species that make up the dolphin family are closely related to whales and in fact include the animal known as the killer whale, which can grow to be 30 feet long and is famous for its aggressive hunting pods.