单项选择题

Passage One
Questions 26 to 28 are based on the passage you have just heard.

A．Relieve pain.
B．Preserve life.
C．Keep energy.
D．Prevent further harm.

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The initial goal of building an aircraft is to make the vehicle fly, and speed was not such a primary consideration.

单项选择题

Passage OneQuestions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。