单项选择题

Questions 11-13 are based on the following conversation on transportation in 21st century.
What does the woman think about travelling by train under the oceans

A．Frightening.
B．Exciting.
C．Unimaginable.
D．Inefficient.

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单项选择题

单项选择题

Questions 11-13 are based on the following conversation on transportation in 21st century. What does the woman think about travelling by train under the oceans 您的浏览器不支持 audio 元素。