Recent studies have shown that air into a house often has higher concentrations of contaminants than heavily polluted air outside 此题为多项选择题。请帮忙给出正确答案和分析,谢谢!
The aging process is not entirely determined by heredity, but is influenced by different environmental and social circumstances as good 此题为多项选择题。请帮忙给出正确答案和分析,谢谢!