公共英语三级考试(模拟题)
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d not get enough sleep
［B］ there was an oily smell from his clothes
［C］ the dog grew accustomed to travelling by train
［D］ the dog was confused about the time of the day
49. It upset Williams wife and family when .
［A］ Williams had to go to work at night
［B］ the dog made too much noise in the house
［C］ Williams made them all get up early
［D］ the dog would not let them see the newspaper
50. Williams did not realise his loss for several days because .
［A］ he trusted the dog to find the wallet
［B］ he was unconscious all that time
［C］ he thought the wallet was in the house
［D］ he had no occasion to feel in his pockets
Text 2
About ten men in every hundred suffer from colour blindness in some way; women are luckier only about one in two hundred is affected in this manner. There are different forms of colour blindness. A man may not be able to see deep red.
He may think that red, orange and yellow are all shades of green. Sometimes a person cannot tell the difference between blue and green. In rare cases an unlucky man may see everything in shades of green—a strange world indeed.
In certain occupations colour blindness can be dangerous and candidates are tested most carefully. For example, when fighting at night, soldiers use lights of flares to signal to each other. A green light may mean “Advance” and a red light may mean “Danger! Keep back!”, You can see what will happen if somebody thinks that red is green! Colour blindness in human beings is a strange thing to explain. In a single eye there are millions of very small things called “cones”, These help to see in a bright light and to tell the difference between colours. There are also millions of “rods” but these are used for seeing when it is nearly dark. They show us shape but not colour. Wait until it is dark tonight, then go outside. Look round you and try to see
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