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  3. Some scientists think that parents make too big fuss about hygiene, and that dai

Some scientists think that parents make too big fuss about hygiene, and that dai

游客2023-10-15  66
问题 Some scientists think that parents make too big fuss about hygiene, and that daily 【M1】 ______
contact with bacteria and viruses can be good for youngster. A recent study conducted 【M2】 ______
by the University Children’s Hospital in Munich showed that children who had
at least two mild virus infections before their first birthday were only the half as 【M3】 ______
likely to be diagnosed with asthma or allergies when they were seven, compare with 【M4】 ______
children who had been ill only once or not at all. This finding supports the hypothesis 【M5】 ______
that today’s ultra-clean lifestyle is the reason of an increase in allergies in the general 【M6】 ______
population in developed countries. It is possible, although this is not yet establish, 【M7】 ______
which contact with the bacteria is needed for cells in human immune systems to 【M8】 ______
develop correct. So parents should not overreact if their children get muddy or 【M9】 ______
dirt sometimes when playing outside. 【M10】______ [br] 【M10】
选项
答案 dirt→dirty
解析 (dirty脏的，与muddy是并列关系。)
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