Some scientists speculate that children who wash frequently are more likely to b

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问题 Some scientists speculate that children who wash frequently are more likely to become asthmatic than those who wash infrequently: that______, not the lack of it, is the problem.

选项

答案 C,E

解析 that表示指代,说明前文与后文同义重复。空格与wash(洗手)同义重复。pollution污染,dirtiness肮脏,scour洗净,misbehavior举止不端,cleanliness清洁,nutrition营养。答案选CE。
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