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Some say it is evident that computers can damage a person’s eyesight. Since the popularity of computers began to skyrocket, there have been questions (1) with computer screens and eye strain. There are plenty of symptoms that often show up as a result of eye strain from computer screens. It may first start with a little (2) . Then, it may progress to dry eyes, (3) vision and even headaches. However, the extent to which computer screens damage eyesight is (4) unclear.
Taking a ten to 15 minutes’ break every hour while working is a good way to help avoid this and rest your eyes, though your (5) may not be as generous with your break periods, if possible, break up computer tasks and non-computer tasks throughout the day as much as possible.
One of the major improvements in computer screens has also helped. Still, even an LCD screen, if it is not adjusted (6) or if it is too bright, can be just as hard on

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Some say it is evident that computers can damage a person’s eyesight. Since the popularity of computers began to skyrocket, there have been questions (1) with computer screens and eye strain. There are plenty of symptoms that often show up as a result of eye strain from computer screens. It may first start with a little (2) . Then, it may progress to dry eyes, (3) vision and even headaches. However, the extent to which computer screens damage eyesight is (4) unclear.
Taking a ten to 15 minutes’ break every hour while working is a good way to help avoid this and rest your eyes, though your (5) may not be as generous with your break periods, if possible, break up computer tasks and non-computer tasks throughout the day as much as possible.
One of the major improvements in computer screens has also helped. Still, even an LCD screen, if it is not adjusted (6) <

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[填空题]It is clear that some chemicals can damage the health of animals and humans. However, this is not the only problem that (26) the careless use of chemicals. Chemicals can also disturb the ecological balance of the environment. If the ecological balance is disturbed, the (27) can be extremely serious.
The history of DDT (28) the problem. DDT, a chemical which kills insects, at first seemed to be a perfect answer to many problems. It would control insects that made billions of dollars of damage to crops every year. Farmers in many countries began to (29) DDT on their crops as governments permitted and encouraged its use. The (30) were good: damage to crops went down and profits went up. However, the chemical had effects which the scientists (31) First, it also killed insect which were the natural enemies of the harmful insects and which were therefore (32) to farmers. Second, and perhaps worse, DDT did not

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