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It was just over a decade ago when cell phones were primarily used for calling and sending texts. Today, the uses of cell phones run the gamut. Phones do everything from taking high-resolution pictures to watching pixel-perfect videos, browsing the Internet to playing graphic-intensive games to monitoring your movements in addition to fulfilling basic communication needs. The advent of smartphones has greatly simplified our lives. People now connect with their loved ones more frequently and easily through video calls and instant messaging Services. Tasks, like creating slides, reading emails, and creating documents don’t require a PC anymore. Brieflỵ, smartphone and apps have changed the way we work, communicate and play. While the smartphone revolution has made our lives easy, it has also made us lazy. Today, the whole world is at our fingertips, and thus we don’t have to work or move around like we did previously to get things done. Our inactive lifestyle and lack of physical activities can be partly attributed to the over-dependence on smartphones. This is especially true for the younger generation, who are constantly glued to their cell phones. Cell phone addiction is having a negative impact on our lives. Care needs to be taken to deal with this issue in an effective way. A. Decide whether the following statements are true (T) or false (F). 1. In the past, mobile phones were used only for communication among people. 2. Modern cell phones are capable of much more than just making phone calls. 3. Smartphones make Communications with people quite easier. 4. Smartphone users, however, can’t send and recieve emails on their phones. 5. Despite all the positive benefits of smartphones, there are also negative side effects. 6. Today we don’t have to go to work because we have the whole world at our fingertips. 7. Only young people are now addicted to their mobile phones. B. Answer the questions. 1. What were cell phones mainly used for? ___________________________________________________________________ 2. Are modern cell phones capable of internet access? ___________________________________________________________________ 3. How has the smartphone revolution changed our lives? ___________________________________________________________________ 4. Do smartphones make us lazy and inactive? ___________________________________________________________________ 5. How often do teenagers look at their cell phones? ___________________________________________________________________ 6. Is smartphone overuse good or bad for us? _______________________________________

SOS ! INSTANT Bài 4: (2 điểm) a) Cần dùng bao nhiêu (g) dung dịch KOH 32% để tác dụng với H3PO4 thu được 6,8 (g) KH2PO4 và 4,24 (g) K3PO4? b) Cần bón bao nhiêu (kg) phân đạm amoni nitrat chứa 97,5% NH4NO3 cho 10,0 (hecta) khoai tây, biết rằng 1,0 (hecta) khoai tây cần 60 (kg) nitơ? Bài 5: (1,5 điểm) Đốt cháy hoàn toàn 10,4 (g) chất hữu cơ X (C, H, O) rồi cho sản phẩm cháy hấp thụ hết vào bình chứa dung dịch Ca(OH)2 dư thấy khối lượng bình tăng 16,8 (g) đồng thời trong bình có xuất hiện 30 (g) kết tủa. Biết khối lượng phân tử của X là 104 (g/mol). Xác định công thức phân tử của X. Bài 6: (1,5 điểm) Hòa tan hoàn toàn 0,12 (mol) Al vào dung dịch HNO3 2M, vừa đủ thu được dung dịch A và 672 (ml) hỗn hợp khí N2 và N2O (đktc). Cô cạn cẩn thận dung dịch A thu được 26,36 (g) muối khan. Tính thể tích dung dịch HNO3 cần dùng. thanks .

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