Question:
1．What is the lecture mainly about?
A. Different kinds of color vision in sea animals
B. Differences in appearance between various species of octopus
C. Ways that octopuses attract their prey
D. Ways that octopuses protect themselves from predators
2．Why does the professor first mention Proteus?
A. To explain how the octopus got its scientific name
B. To introduce the octopus' exceptional abilities
C. To point out that the octopus played an important role in Greek mythology
D. T
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