如图，两幢建筑物AB和CD，AB⊥BD，CD⊥BD，AB=15m，CD=20m，AB和CD之间有一景观池，小南在A点测得池中喷泉处E点的俯角为42°，在C点测得E点的俯角为45°（点B、E、D在同一直线上），求两幢建筑物之间的距离BD（结果精确到0.1m）．（参考数据：sin42°≈0.67，cos42°≈0.74，tan42°≈0.90）

    长期以来，受“重发展、轻保护，重经济、轻环境”思想的影响，长江的开发建设与生态环境保护缺乏统筹协调，各自为政，甚至为一地之经济发展置整个流域于不顾，没有将“山水林田湖”作为生命共同体，上下游、干支流、左右岸和水陆之间缺乏有机衔接。近几年，长江生态系统警钟不时敲响：长江水质不断恶化，沿线水污染事件多发，威胁百姓用水安全；白鳍豚、白鲟多年不见踪迹，长江江豚仅余千头，顶级物种纷纷告急……为保护好长江母亲河，国务院提出：推动长江经济带发展，理念要先进，坚持生态优先、绿色发展，把生态环境保护摆上优先地位，涉及长江的一切经济活动都要以不破坏生态环境为前提，共抓大保护，不搞大开发。思路要明确，建立硬约束，长江生态环境只能优化，不能恶化。

    Today it is found that school students hardly pay much attention to sports. Is it because they aren't interested in sports? No. They often say they have other more important things to do.

    What are these important things? Examinations! Students have to spend much time on all kinds of examinations at school. So many of them almost become bookworms (书呆子). Books stop them from doing sports. Because of the pressure from their parents and teachers, the students have to work harder and spend most of their time on books. As for (就……而言) the students, they want to get good results so that they can improve their studies. So it is necessary（必要） for them to give all of their free time to their studies and stop their school sports.

    In fact, education can't go without physical (身体的) exercises, because a quick mind hardly goes along with a weak body. If you don't have a strong body, you can never get anything, let alone (更不用说) a great success in your life.