Một căn phòng hình hộp chữ nhật có chiều dài 8m, chiều rộng 6m,chiều cao 4m. Người ta lăn sơn 4 bức tường và tần nhà của căn phòng. Tính diện tích lăn sơn của căn phòng (biết diện tích cửa là 7,2 m²)giải giúp em

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In the early years of television, educational specialists believed that it would be very usefulin teaching and learning. Many schools have bought television sets, intending to use themeffectively to improve the quality of education; but actually they are not used properly inclassrooms. Meanwhile, children spending the majority of their out- of school hours watchingTV and their typical school days proceed as if television did not exist. There are someexplanations for the failure of television to get the interest of the teachers. Firstly, the schoolsthat purchased television sets have not set aside money for equipment repairs and maintenance sothese television sets are sooner and later out of work. Secondly, these schools have not found aneffective way to train teachers to integrate television into their ongoing instructional programs.Lastly, most teachers do not regard the quality of television and its usefulness in the classroom.Teachers at the schools work hard for at least twelve years to train their students to become goodreaders. However, according a recent statistics, teenagers seldom spend their free time readingbooks and newspapers but watching television instead. (integrate: combine)33. When TV first appeared, educational specialists _______. A. did not appreciate it B. did not think it would be useful C. believed it would be useful for schooling D. banned children from watching TV34. Teenagers seldom spend their free time _______. A. intergrating television into their ongoing instructional programsB. watching televisionC. training their students to become good readersD. reading books and newspapers 35. According to the text, TV _______. A. has not been used properly in classroom B. has been used effectively in classrooms C. has not existed in classrooms D. has not attracted students’ interest 36. Children spend the majority of their free time _______. A. reading books. B. reading newspapers C. learning foreign languages D. watching TV