单项选择题

Questions 13 and 16 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage.
What is this passage mainly about

A．The necessity of protecting sharks.
B．The living environment of sharks.
C．The dangers of sharks to human beings.
D．An introduction to sharks.

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单项选择题

单项选择题

Questions 13 and 16 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. What is this passage mainly about 您的浏览器不支持 audio 元素。