Lifestyle factors that increase the risk include drinking too

　　much alcohol, not doing enough exercise or eating a high­salt diet over a long period of time.Smoking a cigarette immediately raises blood pressure as the chemicals in cigarettes stimulate the arteries to constrict(收缩)．Sudden high levels of stress can also cause a short­lived increase in blood pressure.When you relax，it will fall down.We should pay more attention to our lifestyles and be far away from high blood pressure.

　　5．What may happen when high blood pressure happens?

　　A．The flow of blood becomes easier.

　　B．The heart stops working immediately.

　　C．Both the heart and the arteries suffer hurt.

　　D．The arteries around the body become thinner.

　　6．Which of the following statements is NOT true?

　　A．When blood is pumped around the body by the heart，it causes force.

　　B．The level of pressure depends on how wide the blood vessels are.

　　C．Long­term high blood pressure will cause eye problems and kidney disease.

　　D．The blood pressure of a healthy person is normally fixed throughout the day.

　　7．It is implied in Paragraph 3 that________．essure

　　D．if the father has high blood pressure，his children will have the same problem

　　8．What does the underlined word“short­lived”in the last paragraph mean?

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