单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will he given 20 seconds to answer the questions.
Now listen to the passage.
What is the talk mainly about

A．Reproduction in echinoderms.
B．How fish avoid their enemies.
C．The form of starfish.
D．The feeding habits and digestive systems of starfish.

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单项选择题

单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will he given 20 seconds to answer the questions. Now listen to the passage. What is the talk mainly about 您的浏览器不支持 audio 元素。