单项选择题

Passage One Questions 11 to 13 are based on the passage you have just heard.

A．From the wind.
B．From manpower.
C．From a generator.
D．From rechargeable batteries.

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S1. If you want to live an old age, the most important thing you should do is to _______.

单项选择题

Passage One Questions 11 to 13 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。