题目内容

How did Mrs. Sifter get the attention of one of the author's children？

A. flunking him.
B. moving his seat.
C. blaming him.
D. playing card with him.

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Making sure that Bluetooth and these other devices don’t interfere with one another can be

A. Y
B. N
C. NG

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？

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

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

A. Y
B. N
C. NG