单项选择题

It's implied in the passage that ______.

A． electronic books are available in stores now.
B． electronic books are still in the stage of development
C． researchers might give up the project due to large-scale manufacturing
D． the technology may turn out to be deceptive.

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单项选择题

The first paragraph tells us that ______.

A． FAA officials are learning to operate a computer
B． commercial airliners and private jets can be shown on the same screen
C． a map of the New York area airspace can be shown on the screen
D． a computer program has been introduced to control air traffic

单项选择题

Unfold means ______.

A． to appear and spread
B． to fly over
C． to set to work
D． to get busy