【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...
【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;...