雅思阅读经典长难句解析

1. Physical anthropology, or biological anthropology as it is also called, concerns the study of human biological or physical characteristics and how they evolved. (剑4, test4 passage 2)

　　分析：本句的主句为“Physical anthropology, or biological anthropology concerns the study of human biological or physical characteristics and how they evolved”;“as it is also called”定语从句，做biological anthropology的定语，关系词为as;“how they evolved”为how引导的宾语从句，做concern的宾语。