填空题：Directions：In this section,you will hear a passage three tim

Directions：In this section,you will hear a passage three times．When the passage is read for the first time，you should listen carefully for its general idea．When the passage is read for the second time，you are required to fill in the blanks numbered from 36 to 43 with the exact words you have just heard．For blanks numbered from 44 to 46 you are required to fill in the missing information．For these blanks,you can either use the exact words you have just heard or write down the main points in your own words.Finally,when the passage is read for the third time，you should check what you have written,
注意：此部分试题在答题卡2上；请在答题卡2上作答。
Hair loss may be either the result of illness or a normal genetic response to testosterone，the male sex hormone．A healthy human head has from 80,000 to 150,000 hairs，each of which passes through three phases of growth(36)________of all the others．At any time，90 percent of the hairs are in the growing(37)________,which lasts anywhere from 1 to 5 years．Growth is followed by a resting phase；this ends after a few months，after which the hair is shed to allow new growth．A daily loss of 50to 200 hairs is a normal part of the cycle．
Although baldness is(38)________by hormonal factors，it tends to run in families；your risk may be(39)_______from the number of bald males among members of both parents’families.(40)________hair loss may be(41)________by metabolic disorders(including diabetes，thyroid disease，and crash diets)；damage to hair shafts caused by harsh treatments；stress brought on by illness；hormonal changes of (42)_______；medical treatment，including cancer chemotherapy；and very(43)_______scalp disorders．
(44)_______________________________________,biotin,zinc,or protein．Such deficiencies are rare，although an excessive intake of raw egg whites can lead to a depletion of biotin．
The only medicines for baldness are minoxidil(Rogaine)，a topical medicine，and finasteride(Propecia),an oral Prescription drug.(45)________________.Hair that falls out during a crash diet soon regrows once nutrition returns to normal(46)_______________.
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