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【简答题】年《宣言》问世。
【简答题】Mobile phones began to proliferate through the 1980s with the introduction of "cellular" phones based on cellular networks with multiple base stations located relatively close to each other, and proto...
【单选题】Based on the result of those case-crossover studies, while driving, using a handsfree cellular device is _______ using a hand held cell phone,
A.
as safe as
B.
not safer than
C.
hard to tell which is safer
D.
safer than
【简答题】U2-Listening-Section A-Task 2 Listen to the recording again and choose the proper words or expressions given in the brackets to fill in the blanks. (听录音,选择适当的词汇) A mobile phone is a (1)________ (wire;...
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