Scientists study how parents and their babies______, to better understand how infants learn.

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问题 Scientists study how parents and their babies______, to better understand how infants learn.

选项 A、interchange
B、interrelate
C、intercourse
D、interact

答案D

解析这几个选项的头两个音节都是inter-，表示“交互，相互”的意思。interchange(交替，交换)；interrelate(相互关联，相关)；intercourse(交往，交际，沟通(情感)等)。

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