Constant worry and tension can have many harmful effects on the human body.It is a known fact that stressful times can cause one to suffer hair loss.It would make sense that if it can cause these problems，perhaps it also may contribute to graying.However，there is no sound evidence to support this.

　　On the other hand，many medical professionals believe that there may be a link between graying and a constant state of anxiety or tension.Does stress cause gray hair？There is no scientific evidence to support the theory，but it is best to avoid stressful situations.

　　1．The underlined phrase in the first paragraph most probably means________.

　　A．clever remarksB．silly remarks

　　C．exciting remarks

　　D．disappointed remarks

　　2．The second paragraph mainly tells us________.

　　A．every part of body is replaced with age

　　B．hairs will grow weak but not die

　　C．skin becomes wrinkled with age

　　D．every part of body ages with age

　　3．What might play the most important role in the graying process?

　　A．Genetics and the amount of sleeping time.

　　B．The amount of food people eat and living environment.

　　C．The amount of pigment and genetics.

　　D．Genetics and the amount of water people drink

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