阅读下面这首古诗，完成下列各题。

江南春

寇准

波渺渺，柳依依。

孤村芳草远，斜日杏花飞。

江南春尽离肠断，满汀洲人未归。

化简$\frac{1}{1\times 2}+\frac{1}{2\times 3}+\frac{1}{3\times 4}+\cdots +\frac{1}{9\times 10}$得（  ）

阅读下面的诗文，回答相关问题

                                                                晚春江晴寄友人
                                                                      韩琮
                                                         晚日低霞绮，晴山远画眉。

                                                         春青河畔草，不是望乡时。
【注】韩琮，字成封，长庆进士。初为陈许节度判官，后历中书舍人、湖南观察使等职。

     Yoga is a kind of sport. It is very popular around the world now. Everyone, young and old can do yoga. It's good for both men and women.

 Why do people like yoga? There's a short answer and a long answer to that question. The short answer is that yoga makes you feel better. Practising, breathing exercises and thinking make you healthier in body, mind and spirit. For many people, that's enough of an answer, but there's more if you are interested.
     Yoga began in India about 5,000 years ago. At that time, people wanted to be free, healthy and live a long life, so this kind of exercise was born. The early yoga was part of a religion (宗教). It was usually taught one to one—one teacher with one student. Yoga is an Indian word that means “to join together”. There are three parts of yoga altogether: exercise, breathing and meditation (沉思). In the past, people paid more attention to the spirit. The idea be­hind the exercise was to join the mind, body and spirit as one. Yoga can give you peace, help you feel relaxed, and have fewer worries and illnesses.