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tiduong2807
2 năm trước
khảo sát sự biến thiên của hàm số y=1/2-x trên từng khoảng (-vô cực;2) và (2;+vô cực)
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Fill in each blank with ONE suitable word. performed timers were since started Before the invention of electronic devices there (15) __________ plenty of mechanical entertainment devices. Many of these were portable since they needed no electricity. For example, musical boxes have existed (16) ____________ the 1700s but it wasn’t until the 1820s when industrial production (17) __________ that they became popular. There were many other automated mechanical devices created by artisans for the wealthy, the 1850 ‘ pianola’ for instance. Prior to the introduction of mobile phones and MP3 players, people used to enjoy listening, singing and dancing to the rhythm of those old machines. (18) ___________ arts such as juggling and acrobatics, alongside newspapers, once was amongst the most favorable ways young people spent their leisure time. Whenever I hear old (19) __________ complaining about the young using smartphones in public, I often wonder what it used to be back in the old days, when the same timers were glued to the newspapers while presumably, their elders looked on shaking their head.

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