1.Riding
is
a
sport
and
also
an
Olympic
game.So
it
can
benefit
our
health
and
help
to
generate
a
sense
of
well-being.
2.You
can
experience
a
sense
of
speed
and
freedom,especially
when
you
ride
by
the
sea.
3.You
can
be
happy
or
just
out
of
spite
when
you
ride
with
your
friends.
But
you
must
watch
out
for
safety.
答案补充
1.骑自行车是个运动方式也是一个奥运项目。所以它可以强身健体，有益身心。
2.你可以体验一种速度感和自由，尤其是当你骑着自行车沿着海岸线骑自行车。
3.和朋友们一起骑自行车的时候你会感到幸福或者仅仅是为了泄愤而骑自行车。
但是你要注意安全。
PS：我以前就是很喜欢骑自行车，但是因为骑太快了，出过几次事故，所以奉劝你一定注意安全。

“低碳”这个词已经成为了我们耳熟能详的词了，但许多人都还不知道低碳的重要性，那就让我来讲讲吧！
最重要的一点就是多骑自行车环保，这样减少了臭氧层，就做到了我们力所能及的事了。
希望大家和我一起保护我们的地球村！

　骑自行车可以使心率在一分钟内达到120，即中等强度，是比较适宜老年人的一种强度。骑自行车，环保又健康，可对于65岁以上的老年人来说，这种方式还真不宜广泛推广。　　国内外也有很多研究表明，尽管自行车运动对预防心血管等疾病有好处，但如果没有医生的指导，不科学的骑车运动会使高血压患者血压升高，冠心病患者心脏负担加重。　　所以，老年人在以骑自行车为健身方式时，一定要量力而行，强度以心率保持在120以内为宜;每次骑前别忘了先做几分钟的热身运动; 天气不好时最好选择别的健身方式。　　此外，现在市面上流行的电动自行车，老人千万要敬而远之。因为老人在体力、视力及灵敏度上都不如年轻人，在避让过程中易造成事故，导致受伤。
打字不易，如满意，望采纳。

Bicycles are important transport. There are many advantages to go to www.souquanme.comschool by bike.
Firstly, it is cheap and fast when your //www.souquanme.comhome isn't far from school. Secondly, it is a good way to exercise and it can make you strong and healthy. Thirdly, when you go to school by bike, you can enjoy the beautiful sceneries and at the same time you can enjoy a wonderful talk with your friend. But when students ride their bikes, they mustXYYVRl obey the traffic rules and they shouldn't do dangerous tricks on their bikes.
As far as I am concered, their bikes must have brakes. What's more, they should learn basic cyclXYYVRling skills and check the tires often.