时间:2021-06-15 09:53 来源：陕西成考网 点击: 206 次
Hair loss is one of those things we still do not understand. Science has, of course, shown that men are more likely than women to suffer major hair loss. Some kinds of hair loss are temporary (暂时的), an effect of illness. In those cases we can expect the hair to grow back.
It all depends on whether the hair root is alive. If it is not, hair loss is permanent and nothing will help.
Some daily loss of hair is a normal, healthy sign. Most people lose between 40 to 50 scalp hairs each day.
Each of these scalp hairs grows for from two to six years and then rests. About three months later it is pushed out by a new hair growing from the same root.
This is not something that should cause great concern.
Something else we know is that normal hair loss is seasonal, with the most hair loss occurring in the fall. Everyone experiences a normal cycle of loss and growth.
The problem of hair loss results when loss is greater than growth.
The main cause of hair loss in men seems to be accumulation (积累) of a hormone (荷尔蒙) in the body. When that hormone reaches a certain level, the hair growing period is shortened and hair loss is the result. This is no cure for most cases of hair loss. This, however, is not the end of the world.
66. According to science, _________.
A.hair loss is a normal, healthy sign
B.man should pay special attention to hair loss
C.it's likely that men have more problems of hair loss
D.men lose more hair than women do
67. The writer thinks _______.
A.illness causes hair loss
B.human beings have no way to cure hair loss
C.hair loss happening in the fall is an effect of illness
D.hair loss is permanent
68. We now know that the most hair loss happening in the autumn is ________.
A. permanent B. healthy sign C. seasonal D. nothing serious
69. The sentence 'This, however, is not the end of the world' means _______.
A.man is sure to find the best way of curing his hair loss in the future
B.the writer believes the earth exists for ever
C.we can't destroy the world by any means
D.the last day will never come to our people
70. The best title for the passage may be ________.
A. Loss or Growth B. Hair Loss C. Healthy Sign D. Change with Seasons