牛津譯林版高中英語(yǔ)選修八unit2theuniversallanguageperiodtwo同步練習(xí)-資料下載頁(yè)
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【導(dǎo)讀】1.—Isheingbacktoday?wecandonowiswait.________byanadult.popularinourcity.hisnamewas,hemadenoanswer.—IwishI________.—Notatall,________.—Yes,IknowI________.anyother.—Certainly________！13.—Areyouateacher?—No,butI________.Doyouknow
【正文】 and there are many different skin colors in the world. Reasons for skin color The reasons for different skin colors mainly in biology and history. Biology reasons The amount of melanin,by which a person’ s skin color is ,varies from people to more melanin a person has,the his or her skin will be. Vitamin D is another source skin D is necessary for humans to build contributes to vitamin D in the skin. History reasons The earliest people in Africa had dark skin with hair covering it because the sunlight is very strong. When they moved to places where they could not get enough sunlight to vitamin D,their skin color became speaking,people in areas with strong sunlight,have darker skin people in other areas have lighter skin. Melanin an important role in our skin our living environment changing,melanin production is changed,which leads to the changes in our skin color. 答 案 基礎(chǔ)落實(shí) Ⅰ .1.—— 他今天回來(lái)嗎 ？ —— 我猜他回來(lái) 。 /我希望他不回來(lái) 。 ,只是在那兒坐著 。 。 。 5.如果有必要我借給你一個(gè) 。 Ⅱ . 能力提升
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