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 does the speaker say about the skin of starfish

A．It consists of a protective film.
B．It is covered with scales.
C．It can be shed easily.
D．It is covered with sharp bumps.

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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 does the speaker say about the skin of starfish 您的浏览器不支持 audio 元素。