When you exercise too hard, you may feel something．Take note of these feelings because it's time to stop your exercise and get medical attention．
You may breathe a little more heavily than usual during a great exercise, but you should not feel that during a light after- dinner walk．Certain feelings When you exercise lightly could sometimes suggest something serious, says Martha Gulati, MD, at Rush University Medical Center in Chicago．If you're healthy and in good shape but experience any of the warning signs in the form below during an exercise, stop what you're doing and see your doctor at once．
| What You Feel | What It Could Mean |
| Chest pain，pressure，or tightness （绷紧） | Heartburn，muscle strain，or something more serious， like hear disease |
| Unusually rapid heartbeat | Heart disease，arrhythmia，anemia，thyroid disease |
| Difficulty breathing | Heart disease or asthma |
| Fainting（头晕） | Heart disease，arrhythmia，a problem in your nervous system，dehydration，or low blood sugar |
| Serious headache | Dehydration，stroke，or high blood pressure |
1．The situation that you breathe heavily during a powerful exercise is _______ that you feel during a leisure walk．
A．just like B．less than C．not the same as D．worse than
2．When we are doing sports, we should _______ certain feelings so that we can keep healthy．
A．go on B．pay no attention to
C．not care D．pay more attention to
3．Where is Martha Gulati, MD from?
A．America． B．Russia． C．The UK． D．Australia．
4．If you have low blood sugar, you should _______ during the exercise．
A．have stomachache B．have serious headache
C．be unable to keep balance D．have chest pain
5．What can we know from the passage?
A．When we feel fainting, it could mean heartburn．
B．When we have serious headache, it could mean stoke．
C．When we have difficulty breathing, it could mean low blood sugar．
D．We can't do exercise after supper．
An American Teenager's School Report
| SPRING--TERM SCHOOL REPORT Term：spring Name：Becky Elizabeth Pringle Age：15 Grade：9 Number in the class：18 | |
| English | She likes writing notes to her friends，but she doesn't like writing compositions(作文)．Her work is full of spelling mistakes（错误）．I believe she's able to do better． |
| Maths | She is good at counting numbers，but she's lazy．She doesn't always pay attention to her homework and she spends most of her time talking to the boy in front of her． |
| Foreign Language | She will never succeed in learning foreign languages if she always speaks English |
| History | Getting better． |
| Geography | Nice work． |
| Drawing | Very good! She likes drawing pictures of her teachers． |
| PE | Excellent |
| Music | OK． |
| General：Becky is still a bit of a tomboy and she always acts like a boy．She often gets into trouble with her teachers．She likes talking during classes．She is good at PE and especially likes playing football and climbing trees with the boys． | |
1．The best way for Becky to learn foreign languages is _______．
A．to get up earlier
B．not to make spelling mistakes
C．to make more friends
D．to speak foreign languages as much as possible
2．Becky always draws pictures of _______．
A．teachers B．boys C．cartoons D．mountains
3．According to all the ideas, which teacher likes Becky best?
A．Her English teacher． B．Her math teacher．
C．Her foreign language teacher D．Her PE teacher．
4．The underlined word "tomboy" means _______．
A．a girl who has a boy's name B．a girl who likes boys
C．a girl who acts like a boy D．a girl who wants to be a boy
5．Which of the following is not true according to the school report?
A．Becky is fifteen years old now．
B．Becky doesn't listen to the teacher carefully in math class．
C．Becky doesn't make many mistakes at English writing．
D．Becky does well in PE and her history grade is better than before．