Alopecia areata has a different system of hair loss，but can also be caused by stressful events.In alopecia areata，the immune(免疫的)system attacks the hair follicle，causing it to stop growing；this results in limited areas of hair loss.Usually the hair grows back in at most six to twelve months；sometimes this area of hair will be a slightly different color.

　　Stress won’t cause you to go hairless，but it might leave you with a haircoated pillow(枕头)sometime in the near future.

　　Topic 1.______ hair loss caused by stressful events

　　2.______ Emotional stress influences hair follicle cycling in mice and 3.______an end to the normal period of active hair growth before the hairs begin to 4.______ out.

　　Telogen effluvium *5.______ a physical or psychological stress，it stops large numbers of hairs from growing. *Generally，these hairs are

　　6.______ enough to grow back in six to nine

　　months.

　　Alopecia areata *The immune system attacks the hair follicle. *It results in localized hair 7.______. *These hairs will return 8.______ six to twelve months.

　　9.______ Stress doesn’t necessarily make you hairless，but it may cause your hair to fall out at a 10.______ rate.

　　参考答案与解析

　　课时作业(二十六)

　　Unit 13　B卷

　　一、阅读理解

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