A．its vacuum tubes.B．Its electronic circuits.C．Computer programs.D．All of the above.
A. its vacuum tubes.
B. Its electronic circuits.
Computer programs.
D. All of the above.
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A．It meant he disliked the thought of having a snake in the house.B．It meant he was af
A. It meant he disliked the thought of having a snake in the house.
B. It meant he was afraid David would put the snake in his bedroom.
C. It meant he was afraid that the snake would hurt David.
D. It meant he wouldn't enter his bedroom until David took the snake out of it.
【C9】
A. entering
B. corning
C. going
D. passing
A．No one knows exactly how silk was made.B．No one knows exactly when silk was made.C．T
A. No one knows exactly how silk was made.
B. No one knows exactly when silk was made.
C. The history of the silk is a fascinating story.
D. The Chinese people kept the secret of how to make silk for as long as 4,000 years.
A．The advantages and disadvantages of computers.B．The future of the computer.C．The mai
A. The advantages and disadvantages of computers.
B. The future of the computer.
C. The main features of the computer.
D. The scientific principles of the computer.
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