外生殖器向雌性分化主要是由于（） A.雌激素作用 B.雄激素作用 C.染色体决定 D

阅读理解。

     If women are mercilessly exploited(剥削) year after year, they have only themselves to blame.

Because they tremble at the thought of being seen in public in clothes that are out of fashion, they

are always taken advantage of by the designers and the big stores．Clothes which have been worn

only a few times have to be put aside because of the change of fashion．

     Changing fashions are nothing more than the intentional creation of waste．Many women spend

large sums of money each year to replace clothes that have hardly been worn．Women who cannot

afford to throw away clothing in this way, waste hours of their time changing their old-fashioned

dresses．Skirts are lengthened or shortened; neck-lines are lowered or raised, and so on．

     No one can claim that the fashion industry contributes anything really important to society.Fashion

designers are rarely concerned with necessary things like warmth, comfort and durability (耐用)．

They are only interested in outward appearance and they take advantage of the fact that women will

put up with any amount of discomfort, as long as they look right．There can hardly be a man who

hasn't at some time in his life smiled at the sight of a woman shaking in a thin dress on a winter day,

or picking her way through deep snow in high heeled shoes．

     When comparing men and women in the matter of fashion, the conclusions to be drawn are obvious．Do the constantly changing fashions of women's clothes, one wonders, reflect basic qualities of

inconstancy and instability? Men are too clever to let themselves be cheated by fashion designers．

Do their unchanging styles of dress reflect basic qualities of stability and reliability? That is for you to

decide．

1．Designers and big stores always make money_________．

A．by mercilessly exploiting women workers in the clothing industry

B．because they are capable of predicting new fashions

C．by constantly changing the fashions in women's clothing

D．because they attach great importance to quality in women's clothing

2．To the writer, the fact that women change their old-fashioned dresses is seen as ___________．

A．a waste of money

B．a waste of time

C．an expression of taste  

D．an expression of creativity

3．New fashions in clothing are created for ___________．

A．the commercial exploitation of women        

B．the women's strength of character

C．basic qualities of inconstancy and instability    

D．an important contribution to society

4．By saying "the conclusions to be drawn are obvious" ( Line One to Line Two, Paragraph Four), the

writer means that ___________．

A．women's inconstancy in their choice of clothing is often laughed at

B．women are better able to put up with discomfort

C．men are also exploited greatly by fashion designers

D．men are more reasonable in the matter of fashion

为“约”若干时，系指取用量不得超过规定量的

A．±15%
B．±10%
C．±5%
D．±1%
E．±0.1%

什么是汽轮机速比和最佳速比？

简述感湿灵敏度定义。