完形填空

　　Eddie has lots of hobbies, but he loves baseball best．So it is his 　　1　　 sport．Eddie plays baseball on a team every year in the spring．He loves to go to baseball 　　2　　．

　　Every day when it is 　　3　　, Eddie’s father throws a baseball to Eddie in the backyard．This is the time of day that Eddie 　　4　　 best．He enjoys spending time with his father and he loves practicing baseball．

　　Eddie 　　5　　 baseball cards throughout the year．He and his father visit the 　　6　　 and buy cards for Eddie’s collection．Eddie spends hours with his baseball cards．He arranges them in different 　　7　　, and trades them with other baseball 　　8　　．

　　One day, Eddie’s father came home with two tickets to 　　9　　 the Atlanta Braves play the next Saturday．Eddie was so 　　10　　．He counted down the days on the calendar．

　　Finally it was the day of the game．Eddie and his father 　　11　　 to Atlanta early in the morning．Before they watched the match, they 　　12　　 the Braves’ museum at the stadium and saw a short movie 　　13　　 the history of the Atlanta Braves．Eddie enjoyed seeing the museum．They ate 　　14　　 at the stadium, and soon it was time for the game．

　　The game was exciting．Eddie tried to 　　15　　 every move the players made．　　16　　 he watched carefully and practiced a lot, he might just be on one of those baseball cards some day!

　　　　17　　 the game, Eddie and his father drove home．They talked about the game．They talked about which 　　18　　 were the best, and which 　　19　　 were the most exciting．Eddie went to sleep that night still 　　20　　 of baseball．His dreams were filled with images from his very special day．

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阅读理解

　　It is not always easy to understand inventions and new developments in science．To understand fiber optics(光纤), however, you can try an experiment．

　　Put a drop or two of milk into the glass of water．Turn off the lights．Shine the light from your flashlight(手电筒)through the top of the glass at an angle(角度)of about 45 degrees．Put a piece of white paper against the glass when the beam(光束)of light is shining．Move the paper so you can see where the beam is coming out of the glass．You should see a spot of light．Some of the light has passed through the water and through the glass．You see it on the paper．You also see another beam going down into the glass．It is being reflected down into the glass．

　　Next move the flashlight so that the beam is coming straighter down(30 degrees)into the water．You will see the same phenomenon：some of the light is reflected back into the glass．And some escapes out．Now move the beam of light from the flashlight slowly up until you cannot see any light escaping．This point is called the “point of total internal reflection．”The word internal means“inside．”All the light is staying inside the glass．There is no beam showing a bright spot on the white paper．All the light energy is inside the glass．

　　The glass of milky water is like a strand(线)of glass．A fiber optic tube is a bundle of long thin strands of glass, really many tubes．However, the principle(原理)is the same：at a certain angle, all the light energy that goes into the glass fiber comes out the other end．

　　Light is energy．Sound is energy．Radio waves and electricity are both energy．They can all be changed into light, and as light they can all travel along a glass fiber．Light travels at the rate of 186,000 miles per second．Therefore, a message can travel that fast in a glass fiber．This is the principle or law of nature that makes fiber optics work．

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阅读理解

　　It is not always easy to understand inventions and new developments in science．To understand fiber optics(光纤), however, you can try an experiment．

　　Put a drop or two of milk into the glass of water．Turn off the lights．Shine the light from your flashlight(手电筒)through the top of the glass at an angle(角度)of about 45 degrees．Put a piece of white paper against the glass when the beam(光束)of light is shining．Move the paper so you can see where the beam is coming out of the glass．You should see a spot of light．Some of the light has passed through the water and through the glass．You see it on the paper．You also see another beam going down into the glass．It is being reflected down into the glass．

　　Next move the flashlight so that the beam is coming straighter down(30 degrees)into the water．You will see the same phenomenon：some of the light is reflected back into the glass．And some escapes out．Now move the beam of light from the flashlight slowly up until you cannot see any light escaping．This point is called the “point of total internal reflection”．The word internal means “inside”．All the light is staying inside the glass．There is no beam showing a bright spot on the white paper．All the light energy is inside the glass．

　　The glass of milky water is like a strand(线)of glass．A fiber optic tube is a bundle of long thin strands of glass, really many tubes．However, the principle(原理)is the same：at a certain angle, all the light energy that goes into the glass fiber comes out the other end．

　　Light is energy．Sound is energy．Radio waves and electricity are both energy．They can all be changed into light, and as light they can all travel along a glass fiber．Light travels at the rate of 186 000 miles per second．Therefore, a message can travel that fast in a glass fiber．This is the principle, or law of nature, that makes fiber optics work．

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