单项选择题

Questions 18-21 are based on the following passage. You now have 20 seconds to read the questions 18-21.
Which floor is the most dangerous if a cat falls from it

A．The 7th floor.
B．The 32nd floor.
C．The 4th floor.
D．The 20th floor.

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Questions 18-21 are based on the following passage. You now have 20 seconds to read the questions 18-21. Which floor is the most dangerous if a cat falls from it 您的浏览器不支持 audio 元素。