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 get the different shades of color—blonde(or golden)，brown or red.

　　Title：__1__

　　Ⅱ.简答题

　　Some scientists say that the world’s oceans are slowly getting more acidic(酸)．

　　According to the researchers from California，the change is taking place due to higher levels of carbon dioxide(二氧化碳)in the air，whether you noticed it or not.

　　The lowering of the water’s PH value is not great at the moment but could make the living things in the sea in great danger if it continues，they warn.

　　Ken Caldeira and Michael Wickett，from the Lawrence Livermore National Laboratory，report their worries in the journal Nature.

　　Increasing use of petrol causes more carbon dioxide to go into the air，and most of it will eventually go to the seawater.Once in the air，it reacts to form a chemical to make the seawater acidic.Scientists believe that the oceans have already become a little more acidic over the last century.But these researchers have tried to work out what will happen in the future by analyzing what we know about the history of the oceans with computer models of climate change.

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