A. Call on people to protect sharks. B. Point out the living environment of sharks. C. Explain why the sharks are dangerous. D. An introduction to sharks.
更多"What is this passage mainly about"的相关试题:
[单项选择]What is this passage mainly about
A. Unhealthy food supply in high schools. B. Childhood obesity. C. Nutritious food recipes. D. Vending machines in high schools.