多选题 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.

A、 pollution
B、 dirtiness
C、 scour
D、 misbehavior
E、 cleanliness
F、 nutrition

【正确答案】 C、E

【答案解析】[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。