单项选择题

Which of the following statements is TRUE

A．The customer did follow the instructions for using the item.
B．The customer returns the item within required date.
C．The customer finally exchanges the item for a dog sweater.
D．The customer leaves the store without the item.

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单项选择题

In an automated highway system, all the driver needs to do is ______.

A．keep in the right lane
B．wait to arrive at his destination
C．keep in constant touch with the computer center
D．inform the system of his destination by phone

单项选择题

What is the author's main concern

A．How to render automobiles pollution-free.
B．How to make smaller and safer automobiles.
C．How to solve the problem of traffic jams.
D．How to develop an automated subway system.