Because of the COVID-19， （1）more and more people are getting interested in bike riding.The demand（需求）for bike riding is so high that bike stores around the world are running out of the bikes.In the US，bike sales in April of this year were three times as high as last year.The things are similar in countries in Asia and Europe.
    The demand started to go up in mid-March as people began looking for safe ways of getting around.（2）People usually ride bikes in the open air，so it is safe.For people in some cities，about 60% of their trips can be made by bike.
    During the COVID-19 outbreak，（3）riding bikes becomes one of the most popular outdoor activities.With sports centers closed down，biking began to meet the needs of many people.Kids enjoy biking，too.It is a welcome activity when schools are closed and when they can't play with their friends. （4）對(duì)很多孩子來說，騎自行車很有趣。
Biking is also good for the environment （環(huán)境）.Many cities around the world are seeing this as a good time to make their streets safer and greener.They are working hard to create new places for people to ride bikes.（5）如果更多的人選擇騎自行車，空氣就會(huì)更清新。It can greatly cut down car traffic and help make cities a lot greener.

（1）

越來越多的人逐漸對(duì)騎單車感興趣。

越來越多的人逐漸對(duì)騎單車感興趣。

（2）

人們通常在戶外騎單車，因此是安全的。

人們通常在戶外騎單車，因此是安全的。

（3）

騎單車變成最受歡迎的戶外活動(dòng)之一。

騎單車變成最受歡迎的戶外活動(dòng)之一。

（4）

It's fun for many children to ride bikes.

It's fun for many children to ride bikes.

（5）

If more people choose to ride bikes，the air will be fresher.

If more people choose to ride bikes，the air will be fresher.