单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now listen w the passage.
The physical advantages men enjoy in normal conditions are reduced to nothing by ______.

A．conditioning
B．zero gravity in space
C．virtue
D．food and oxygen

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单项选择题

单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen w the passage. The physical advantages men enjoy in normal conditions are reduced to nothing by ______. 您的浏览器不支持 audio 元素。