城市空气中可吸入颗粒物多会导致呼吸系统疾病,这属于影响健康的
A.行为生活方式因素
B.环境因素
C.卫生保健服务因素
D.生物学因素
正确答案是B
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Passage One The ups and downs of life may seem tohave no predictable plan. But scientists now know there are very definite lifepatterns that almost all people share. Today, when we live 20 years longer thanour great-grand