Many people do not have enough time to play a team sport，so instead they have started going running．In the past，jogging in the street was seen as a bit silly and not very cool．But things are changing．Nowadays，lots of people go out running in their spare time．Some people go to lose weight while others simply go to keep fit．The shops are now full of equipment，clothing and gadgets（小器具）for runners．Many runners also have special watches which can track their route and tell them their speed．Even at 4：30o'clock in the morning you sometimes see runners in the streets．Scientists say that along with cycling and swimming，running is a very good way to keep fit．

Unfortunately，running is often quite unpopular with young people at school．In some schools when it rains and it's too wet to play football or hockey，students have to do cross-country running instead．However，now that running has become more fashionable，hopefully more young people will take it up．But，of course，trends change all the time，so let's hope that running is here to stay．

Every year in April，the London Marathon takes place．The race covers a fantastic route in which runners pass lots of the famous sites like The London Eye and Big Ben．People from all over the world come to take part in the London Marathon．Interestingly，marathon running used to be seen as an extreme sport，but now even people who are very unfit take part in marathons every year!Marathons haven't got easier but people have become more interested in running．After the marathon every year the streets suddenly become full of runners．People find it so inspiring that they want to try it themselves．All you need is a bit of determination，so what are you waiting for？

25．It can be inferred from the first paragraph that___．

A．the busier you are，the more you should exercise

B．running is a way of losing weight quickly

C．old concepts are changing over time

D．it's unnecessary to buy the equipment