3．Suppose the year is 1666and we can see a student called Isaac Newton．He's away from his university for a holiday and at home with his family．Isaac Newton continues to study at home．He enjoys physics and thinking about the mysteries（神秘的事）of the world．
On a day there is rain and sun at the same time，he sees a beautiful rainbow（彩虹） in the sky．It has many different colors，he is told that there are five．Newton wants to have his own rainbow because he wants to look at it closely．He decides to do an experiment．On a sunny day he goes inside a small room and makes the room very dark．Then he makes a small hole and the sun comes inside，it's a small ray of light．It is white．Newton takes a prism（三棱镜） and holds it up to the light．The ray of light goes through the prism，but it isn't white now-there are many colours．The prism has split up the white into different colours：Newton has a rainbow．
Newton looks at his rainbow carefully．He can see more than five colours，he can see seven．He says the colours are：red，orange，yellow，green，blue，indigo and violet．
But Newton is a scientist and he's always very interested in how things work．He has his rainbow but he wants to know more．So he takes another prism and holds it up to the rainbow in the same way．The rainbow goes through the second prism，but it isn't colourful now-it's white again．The prism has joined up the colours back into white light．Newton is the first person to understand that light is a combination（组合） of all the rainbow colours together．
57．In 1666Isaac Newton wasD．
A．a famous doctor
B．an assistant in a lab
C．a university teacher
D．a university student
58．In Chinese the words"ray of light"meansA．
A．光线
B．光圈
C．光速
D．灯光
59．The prism can split up the white intoC different colours．
A．less than five
B．five
C．seven
D．more than seven
60．PictureD is right according to Newton's experiment．
A．
B．
C．
D．
