单项选择题

Questions 14-16 are based on the following dialogue. You now have 15 seconds to read questions 14-16. When did the person suffer from the computer related disease

A．At the age of 7.
B．At the age of 8.
C．At the age of 9.
D．At the age of 18.

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______ make it possible for astronauts to reach the moon.

Questions 14-16 are based on the following dialogue. You now have 15 seconds to read questions 14-16. When did the person suffer from the computer related disease 您的浏览器不支持 audio 元素。