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Archimedes was a famous Greek mathematician and scientist. He was born around 287 B. C. and he died in 212 B. C.

Archimedes was most known for one specific idea that he came up with. “Archimedess Principle(定律)”states that a solid object which is immersed in a liquid is pushed up by a force which is equal to the weight of the water that the object moves. For example, if you put a piece of wood and a piece of gold of the same size in water, only the wood will float. Both the wood and gold move the same amount of water, but the wood weighs less than the water, while the gold weighs more.

It is believed the Archimedes discovered this principle when the king of Syracuse asked him to solve a problem. The king wanted to know whether his crown(王冠)was pure gold or a mixture of gold and silver. The king, of course, didnt want to melt his crown to find out. The idea came to Archimedes as he lowered himself into his bath. He noticed how the water spilled out of his tub. He decided to use the same idea for the crown. He knew that a gold crown immersed in water would weigh more than one made of silver. The experiment was done and the goldsmith(金匠)was found guilty(有罪的)of trying to cheat the king.

1. A good title for this section is__________.

A. Archimedes                       B. Archimedes Principle

C. A Gold and Silver Crown              D. The King of Syracuse

2. The word “immersed” in the second paragraph means__________.

A. raised            B. lifted            C. underwater        D. rose

3. From this section we may conclude(推断)that the king's crown__________.

A. moved more water than pure gold of the same weight

B. moved less water than pure gold of the same weight

C. moved more water than pure gold of the same size

D. moved less water than pure gold of the same size

4. The following sentences tell what happened many years ago. Which is the right order of the events(事件)?

a. Archimedes took a bath.

b. Archimedes discovered his principle.

c. The king of Syracuse asked him to solve a problem.

d. Archimedes did the experiment on the crown.

A. b c a d           B. c a b d           C. c a d b           D. b c d a

 

答案:BCAC
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