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A.Our hair and nails are dead like the surface of the skin. |
B.There is skin all over our body. |
C.The skin of our bodies will be completely different in three weeks. |
D.The surface of the skin is made of a living layer. |
A.the functions of the skin |
B.the information from the outside |
C.the water in the body |
D.the temperature of the body |
A.when one’s skin is numb |
B.when one is ill |
C.when the skin is cut |
D.when the sweat glands produce more sweat |
A.a(chǎn)llow more blood near | B.make the skin look blue |
C.keep warmth | D.help the body lose heat |
A.the rays of the strong sun | B.colour cells |
C.top layers of the skin | D.vitamin D |
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A. | The history of money |
B. | How people traded in the past |
C. | The invention of paper money |
D. | The use of coins around the world |
A. | barley had always been used for exchanging |
B. | only a few people knew how to trade with others |
C. | salt was the most widely used item for exchanging |
D. | many kinds of things were used for exchanging |
A. | Around 1300 BC. | B. | Around 1000 BC. |
C. | Around 700 BC. | D. | Around 640 BC. |
A. | replaced | B. | changed |
C. | accepted | D. | invented |
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