实验测得在常温下0.1mol•L^﹣1某一元碱（BOH）pH≠13，0.1mol•L^﹣1的某一元酸$\frac{H^{+}}{O{H}^{-}}$=10¹²（HA）溶液中将两种溶液等体积混合后，溶液中离子浓度关系正确的是（　　）

俄国著名植物生理学家季米里亚捷夫说：它（绿色植物）是窃取天火的普罗米修斯（天神），它所获取的光和热，养育了地球上的其他生物，而且使巨大的涡轮机旋转，使诗人的笔生辉，你认为对这段话最准确的诠释是（　　）

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      Not only adults but also teenagers have problems in their life. Here is a survey showing the main problems of teenagers.

　　They feel stressed because they have too much homework to do both at school and at home. They have lots of exams to take. And parents usually send them to different classes at weekends. They don't have their own time to do what they are interested in.

　　Now more and more teenagers are getting short­sighted. They often read in bed or keep reading for a long time without having a rest. Some of them are crazy about playing computer games. Some spend too much time watching TV.

　　Another serious problem among teenagers is that many of them are becoming fat. They eat too much junk food, but they take little exercise.

　　I think teenagers should think of ways to deal with problems. They should make a plan for study and hobbies and find time to relax as much as possible.