2. 职称英语
  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2024-08-11  51
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] 【M7】
选项
答案 establish→established
解析 (establish为及物动词，it与establish是被动关系，故用过去分词形式。)
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