At one time, ________were the only practical way to cross the vast areas of the west.

A．buses

B．bikes

C．trains

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参考答案

C。第三句话中提到“At one time，trains were the only practical way to cross the vast areas of the west．”

1 had easily established itself as the fastest method of traveling great distances.

A．Sea travel

B．Land travel

C．Air travel

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2 One of the two portions of the total market were targeted:

A．travel haters.

B．anxious fliers.

C．sports lovers.

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3 Anxious fliers are NOT concerned with

A．safety.

B．freedom.

C．cleanliness.

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