题目内容

Judging from the content, this passage is probably written for______.

A. administrators
B. students
C. teachers
D. parents

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This passage was written to______.

A. encourage young people to take up science
B. describe the process of a scientific competition
C. show scientists what young people can do
D. report on a new scientific technique

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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

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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

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Judging from the content, this passage is probably written for______.

A. administrators B. students C. teachers D. parents

This passage was written to______.

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

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

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

A. administrators
B. students
C. teachers
D. parents