A. | can | B. | must | C. | shall | D. | need |
科目:高中英語 來源: 題型:閱讀理解
Brief introduction | People living in a particular area usually have the (71)sameskin colour and there are many different skin colours in the world. |
Reasons for skin colour | The reasons for different skin colours mainly (72)lie/consist in biology and history. |
Biological reasons | The amount of melanin,by which a person's skin colour is (73)determined,varies from people to people.The more melanin a person has,the (74)darkerhis or her skin will be. Vitamin D is another source (75)affectingskin colour.Vitamin D is necessary for humans to build bones.Sunlight contributes to vitamin D production in the skin. |
(76)Historical 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 (77)producevitamin D,their skin colour became lighter. Generally speaking,people in areas with strong sunlight,have darker skin (78)whilepeople in other areas have lighter skin. |
(79)Conclusion/Summary | Melanin (80)playsan important role in our skin colour.With our living environment changing,melanin production is changed,which leads to the changes in our skin colour. |
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科目:高中英語 來源: 題型:閱讀理解
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科目:高中英語 來源: 題型:選擇題
A. | Out of the question | B. | Forget it | ||
C. | That's all right | D. | I couldn't agree more |
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科目:高中英語 來源: 題型:選擇題
A. | may | B. | need | C. | should | D. | must |
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科目:高中英語 來源: 題型:選擇題
A. | should | B. | might | C. | could | D. | will |
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科目:高中英語 來源: 題型:選擇題
A. | settled | B. | settling | C. | to settle | D. | being settled |
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科目:高中英語 來源: 題型:選擇題
A. | did we present | B. | can we present | C. | present we | D. | we can present |
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科目:高中英語 來源: 題型:選擇題
A. | have reflected | B. | are reflecting | C. | will reflect | D. | reflected |
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