What people are more likely to develop eye cataracts?
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4 .Why does the risk of developing skin cancers in children become greater and greater?
A Because they pay little attention to their skin health. B Because they are short of physical training. C Because the earth's protective ozone layer declines year after year. D Because the earth is getting warmer and warmer.
5 .How many people die from skin cancers including melanoma all over the world every year?
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9 .According to the experiment, those teachers were probably anxious about math when they felt______.
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10 .The sixth paragraph tells us that the research findings______.
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