单项选择题

Questions 19 to 22 are based on the passage you have just heard.
How do you explain that we are moving

A．By watching things move past.
B．By feeling the speed.
C．By feeling ourselves being shaken.
D．Both A and C.

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单项选择题

单项选择题

Questions 19 to 22 are based on the passage you have just heard. How do you explain that we are moving 您的浏览器不支持 audio 元素。