题目内容

Spread-spectrum frequency can transmit the same frequency at the same time for more than one device.

A. Y
B. N
C. NG

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What is the author's attitude towards computers？

A. positive.
B. negative.
C. neutral.
D. prejudiced.

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Bluetooth networking transmits data via low-power radio waves between 402 GHz and 480 GHz.

A. Y
B. N
C. NG

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By saying "...computation could drive an even deeper wedge between the rich and poor" (Line 5, Para. 4) the author means______.

A. people are getting richer and richer
B. there will be a small gap between rich and poor
C. the gap between rich and poor is getting larger and larger
D. it's time to close up the gap between the rich and poor

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What did the pilot do with the plane after it took off？

A. He quickly climbed and then stopped the engines.
B. He climbed and then made the plane fall slowly.
C. He took off normally and then cut the engines for 20 seconds.
D. He climbed and then made the plane turn over.

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Spread-spectrum frequency can transmit the same frequency at the same time for more than one device.

A. Y B. N C. NG

What is the author's attitude towards computers？

Bluetooth networking transmits data via low-power radio waves between 402 GHz and 480 GHz.

By saying "...computation could drive an even deeper wedge between the rich and poor" (Line 5, Para. 4) the author means______.

What did the pilot do with the plane after it took off？

A. Y
B. N
C. NG