假定你是李华，你对本班50个学生进行了健康问题的问卷调査。请给你的班主任兼英语老师Jack写一封电子邮件，告知调査的结果和自己的建议。内容主要包括：

1.依据表格内容，综述学生当前存在的健康问题；

2.就中学生如何保持身心健康提出自己的建议。

注意：1.词数100左右；

2.可适当增加细节，以使行文连贯。

Nearly 3,500 years ago,people chewed on leaves or drank a kind of tea made from leaves_______a special chemical to reduce body pains and fever.

Fleming immediately realized that the mould might have an________in treating illnesses caused by bacteria.

Not only has aspirin proved________for reducing fever and helping stop pain,but there are also other things that aspirin can help with.

Some people claim that surfing the Internet is a waste of time.They make the________that children spend too much time chatting and playing games instead of focusing on their school work.

Subject directories are built by humans.Someone has________pages and links and selected all those that are in the directory.

Young people from________backgrounds and different countries can form friendships that will last their entire lives.

Some people have used acupuncture to treat smokers,alcoholics and people who________drugs.

When people need information,from the news and weather forecasts to travel packages and academic research,the Internet is now the first source they________.

This study shows that people who spend too much time on the Internet tend to________from the people and the world round them.