cho thửa ruộng hình chữ nhật có chu vi là 240m chiều rộng bằng 2 phần 3 chiều dài .Biết cứ 100m vuông thu hoạch được 50 kg thóc.Hỏi thửa ruộng thu hoạch được bao nhiêu kg thóc?

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I. Read the passage and do the task that follows. A family portrait is of great value-it is fun to look at now, it's great for relative far away, and it will bring back memories in the years to come. Families change quickly as children will grow. So, plan to make this a regular event. Your family album isn't really complete without this record of all of you together. Getting the whole family together isn't always easy, so a careful plan must be made so that everyone has time to pose. A relaxed, friendly feeling will make the picture. People can't be expected to relax when they are in hurry to do something else. Make your plans when you're all together then set a time convenient for everyone. A family portrait will take some technical planning too. Make up your mind in advance which room you will use. Choose your camera position and check the lighting.If you want to be in the picture, make sure you know exactly how the self-timer on your camera operates. With most cameras you'll have from 8 to 12 seconds to get into the picture after press the button. 1. Why is a family portrait valuable? A. It's fun to look at. B. It reminds people of the past. C. It brings the family atmosphere to the faraway relatives. D. All the above answers. 2. Taking the family portrait should be made a regular event because A. Children will go to the college when they grow up B. There are constant changes in the family C. The size of the family will increase D. The family will break up 3. What makes a good picture? A. People's relaxed feeling. B. People's free time. C. People's appearance. D. People's clothes. 4. What is the best time to make the plan? A. When the time is convenient for everyone. B. When everyone is present. C. When you're having meals. D. When you're not busy doing other things 5. What technical planning should you do before taking a family portrait? A. The camera and lighting. B. The room and the camera's operation C. The place, the lighting, the camera position and the camera's operation. D. The camera position and its self-timer.