A-A+
People should be able to come to a decision ab
问题详情
People should be able to come to a decision about ions in the air if they _______.
A．note their own reactions
B．move to a healthier, area
C．observe domestic animals
D．watch how wealthy people behave
参考答案
正确答案：A
解析：事实细节题。根据文章倒数第二句，人们可以通过观察负离子富含或缺乏对自己的影响作决定，即观察自己的反应，所以选A。
