题目内容：
For questions 12～15, markY (for YES) if the statement agrees with the information given in the passage;
N (for NO) if the statement contradicts the information given in the passage;
NG (for NOT GIVEN) if the information is not given in the passage,
For questions 16～21, complete the sentences with the information given in the passage.
Bluetooth changes small，area networking into a wireless and automatic connection with no need for user intervention and low need of transmission power．
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答案解析：