The most common form of hair loss does not come from disease. In fact we can almost say it is a secondary sexual characteristic. It is called androgenetic alopecia (also known as pattern baldness) and results from a combination of genetic and hormonal(荷尔蒙的) factors.
There are two sorts of melanin(黑色素)present in all types of hair, in different proportions. These make it possible to obtain all the different shades of color—blonde(or golden), brown or red.
专题限时训练(三十二)主干专讲练
作
专限时训练(三十一)
A
1.School Uniform 综合全文内容可判断。
2.Opinions 综合右栏内容可判断。
3.Reducing 根据第二段They believe that the uniforms reduce distractions(分心) and discipline problems.可判断。
4.their studies 根据第二段Schools report that when students dress in “work clothes” rather than “play clothes” they take a more serious approach to their studies.可判断。
5.build school spirit 根据第二段Some teachers feel wearing a school uniform helps build school spirit.可判断。
6.parents 根据第三段To many parents, uniforms are a lessexpensive alternative to shopping at specialty and department stores.可判断。
7.economical 根据第三段They argue that school uniforms are economical, especially compared to designer clothing.可判断。
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