资料题：The main purpose of the passage is to（  ）。

All research to date on body image shows that women are much more critical of their appearance than men much less likely to admire what they see in the minor.Up to a out of 10 women are dissatisfied with their reflection, and more than half may see a distorted image.Men looking in the minor are more likely to be either pleased with what they see or indifferent.Research shows that men generally have a much more positive body-image than women--if anything, they may tend to over-estimate their attractiveness.Some men looking in the mirror may literally not see the flaws in their appearance.Why are women so much more self- critical than men? Because women are judged on their appearance more than men, and standards of female beauty are considerably higher and more in-flexible.Women are continually bombarded(责难)with images of the"ideal" face.And constant exposure to idealized images of female beauty on TV, magazines and billboards makes exceptional good looks seem normal and anything short of perfection seem abnormal and ugly.It has been estimated that young women now see more images of outstandingly beautiful women in one day than our mothers saw throughout their entire adolescence.Also, most women are tying to achieve the impossible; standards of female beauty have in fact become progressively more unrealistic during the last century.In 1917, the physically perfect woman was about 5ft 4in tall and weighed nearly 140 pounds.Even 25 years ago, top models and beauty queens weighed only 8% less than the average woman, now they weigh 23% less.The current media ideal for women is achievable by less than 5% of the female population--and that's just in terns of weight and size.If you want the ideal shape, face etc, it's probably more like 1%。