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　　1. A popular explanation of play has been that it helps juveniles developthe skills they will need to hunt. (test2 passage 3)

　　分析：本句的主句为“A popular explanation of play has been that…”;“that it helpsjuveniles develop the skills they will need to hunt”为that引导的表语从句，作hasbeen的表语;“they will need to hunt”为定语从句，关系词在定语从句中作宾语，被省略。

　　2. Comparing measurements for fifteen orders of mammal, he and his teamfound larger brains (for a given body size) are linked to greater playfulness.(test2 passage 3)

　　分析：本句的主句为“he and his team found larger brains (for a given body size) arelinked to greater playfulness”;“Comparing measurements for fifteen orders ofmammal”为现在分词短语作状语;“larger brains (for a given body size) are linked to greaterplayfulness”为宾语从句，that被省略。

　　3. If you plot the amount of time a juvenile devotes to play each day overthe course of its development, you discover a pattern typically associated witha ‘sensitive period’—a brief development window during which the brain canactually be modified in ways that are not possible earlier or later in life.(test2 passage 3)

　　分析：本句较长，主句为“you discover a pattern”;“If you plot the amount oftime”为if引导的本句的条件状语从句;“a juvenile devotes to play each day over the course of itsdevelopment”为定语从句，作time的定语，关系词在定语从句中作宾语，被省略;“associated with a ‘sensitiveperiod’”为过去分词短语作定语;“during which the brain can actually bemodified”为which引导的定语从句，作window的定语从句;“that are not possible earlier or later inlife”为定语从句，作ways的定语，关系词为that。

　　4. These fracture zones, where the collisions occur, are where earthquakeshappen. (test3 passage 2)

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